Herbalife Ltd. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

Long-Term Debt - Additional Information (Detail)						1 Months Ended			3 Months Ended							9 Months Ended
Long-Term Debt - Additional Information (Detail)	Aug. 16, 2018 USD ($)	Apr. 24, 2018	Feb. 15, 2017 USD ($)	Mar. 09, 2016 USD ($)	May 04, 2015	Aug. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / shares	Feb. 28, 2014 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2018 USD ($) Day d $ / shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Mar. 09, 2011 USD ($)
Debt Instrument [Line Items]
Outstanding principal amount									$ 2,628,700,000							$ 2,628,700,000
Loss on extinguishment of debt																48,500,000
Interest expense									44,000,000			$ 43,000,000				137,700,000	$ 117,400,000
Stock split conversion ratio		2						2
Paid-in-capital in excess of par value									346,800,000							346,800,000		$ 407,300,000
Long-term debt									2,446,600,000							2,446,600,000		2,268,100,000
Convertible notes paid																582,500,000
Letters of credit issued but undrawn									38,800,000							38,800,000
Capped call transactions [Member]
Debt Instrument [Line Items]
Capped call transactions with financial institutions								$ 123,800,000
Prepaid forward share repurchase transactions [Member]
Debt Instrument [Line Items]
Forward share repurchase transactions amount								685,800,000							$ 685,800,000
Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Outstanding principal amount								1,150,000,000	675,000,000							675,000,000		1,150,000,000
Deferred financing costs															26,600,000
Aggregate principal amount of convertible senior notes issued								1,000,000,000
Interest expense									10,500,000			17,200,000				37,900,000	50,900,000
Non-cash interest expense									6,500,000			10,400,000				23,300,000	30,600,000
Amortization of deferred financing costs									$ 700,000			1,000,000				$ 2,300,000	3,000,000
Additional principal amount of convertible notes								$ 150,000,000
Convertible notes, interest rate								2.00%	2.00%							2.00%
Convertible notes maturity								Aug. 15, 2019								Aug. 15, 2019
Convertible notes, conversion feature																Holders of the 2019 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2014, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2019 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2019 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2019 Convertible Notes for each such day; or (iii) upon the occurrence of specified corporate events. On and after May 15, 2019, holders may convert their 2019 Convertible Notes at any time, regardless of the foregoing circumstances.
Convertible notes, number of trading days of threshold limit (whether or not consecutive) \| Day																20
Convertible notes, number of trading days of threshold limit in consecutive days \| Day																30
Minimum percentage of common share price over conversion price for conversion								130.00%
Principal amount of convertible notes								$ 1,000								$ 1,000
Minimum percentage of the product of common share price and conversion rate for convertible notes								98.00%
Convertible notes conversion rate								23.1816								23.2245
Convertible notes conversion price \| $ / shares								$ 43.14	$ 43.06							$ 43.06
Stock split conversion ratio		2
Paid-in-capital in excess of par value								$ 219,100,000							5,100,000
Long-term debt								$ 930,900,000
Effective interest rate on convertible notes								6.20%
Convertible notes paid							$ 583,500,000
Accrued interest							1,000,000				$ 1,000,000
Fair value of liability to convertible notes									$ 660,500,000							$ 660,500,000		1,066,000,000
Unamortized debt discount and debt issuance costs									25,900,000							25,900,000		80,000,000
Convertible senior notes, carrying value of liability component									649,100,000							649,100,000		$ 1,070,000,000
Convertible Senior Notes Due 2019 [Member] \| Repurchase of 2019 Convertible Notes [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt							13,100,000									13,100,000
Repurchase of convertible notes							475,000,000									475,000,000
Fair value of liability to convertible notes							459,400,000				459,400,000
Fair value of equity component to convertible notes							123,000,000				123,000,000
Reduction to long-term debt representing liability component of convertible notes							446,400,000
Reduction to additional paid-in capital representing equity component							123,000,000
Convertible Senior Notes Due 2019 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs															$ 21,500,000
Convertible Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									550,000,000							550,000,000
Deferred financing costs							12,900,000				12,900,000
Aggregate principal amount of convertible senior notes issued							$ 550,000,000				$ 550,000,000
Interest expense									8,600,000							17,900,000
Non-cash interest expense									4,700,000							9,700,000
Amortization of deferred financing costs									$ 400,000							$ 700,000
Convertible notes, interest rate							2.625%		2.625%		2.625%					2.625%
Convertible notes maturity							Mar. 15, 2024									Mar. 15, 2024
Convertible notes, conversion feature																Holders of the 2024 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending June 30, 2018, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2024 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2024 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2024 Convertible Notes for each such day; (iii) if the Company calls the 2024 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after December 15, 2023, holders may convert their 2024 Convertible Notes at any time, regardless of the foregoing circumstances.
Convertible notes, number of trading days of threshold limit (whether or not consecutive) \| d																20
Convertible notes, number of trading days of threshold limit in consecutive days \| d																30
Minimum percentage of common share price over conversion price for conversion							130.00%
Principal amount of convertible notes							$ 1,000									$ 1,000
Minimum percentage of the product of common share price and conversion rate for convertible notes							98.00%
Convertible notes conversion rate							16.0056									16.0352
Convertible notes conversion price \| $ / shares							$ 62.48		$ 62.36		$ 62.48					$ 62.36
Stock split conversion ratio		2
Paid-in-capital in excess of par value							$ 139,900,000				$ 139,900,000
Long-term debt							$ 410,100,000				$ 410,100,000
Effective interest rate on convertible notes							8.40%				8.40%
Fair value of liability to convertible notes									$ 455,800,000							$ 455,800,000
Unamortized debt discount and debt issuance costs									139,100,000							139,100,000
Convertible senior notes, carrying value of liability component									410,900,000							410,900,000
Deferred financing costs recorded as additional paid-in-capital in excess of par value							$ 3,300,000				$ 3,300,000
Convertible Senior Notes Due 2024 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs							$ 9,600,000				9,600,000
Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									400,000,000							400,000,000
Deferred financing costs									$ 5,400,000							5,400,000
Aggregate principal amount of convertible senior notes issued						$ 400,000,000
Interest expense																3,700,000
Amortization of deferred financing costs																$ 100,000
Convertible notes, interest rate						7.25%			7.25%							7.25%
Convertible notes maturity						Aug. 15, 2026										Aug. 15, 2026
Senior notes, redemption price, percentage						100.00%
Senior notes, redemption price percentage with equity offerings						107.25%
Carrying amount									$ 394,600,000							$ 394,600,000
Fair value of notes									407,800,000							407,800,000
Senior Notes Due 2026 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs									5,400,000							$ 5,400,000
Maximum [Member] \| Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Percentage of aggregate pricipal amount of senior notes being redeemed						40.00%
2011 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount repaid														$ 410,000,000
2011 Credit Facility [Member] \| 2011 Term Loan [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount																			$ 500,000,000
Credit facility amendment date																Jul. 26, 2012
Credit facility, maturity date																Mar. 09, 2016
Repayment of prior senior secured credit facility				$ 229,700,000
2011 Credit Facility [Member] \| 2011 Term Loan [Member] \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					2.00%
2011 Credit Facility [Member] \| 2011 Term Loan [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					3.00%
2011 Credit Facility [Member] \| 2011 Term Loan [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					1.00%
2011 Credit Facility [Member] \| 2011 Term Loan [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					2.00%
2011 Credit Facility [Member] \| 2011 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount																			$ 700,000,000
Credit facility amendment date																May 04, 2015
Line of credit facility extended maturity period																1 year
Amended maturity date of credit facility																Mar. 09, 2017
Repayment of prior senior secured credit facility			$ 410,000,000
Revolving credit facility termination date																Feb. 15, 2017
2011 Credit Facility [Member] \| 2011 Revolving Credit Facility [Member] \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.00%
2011 Credit Facility [Member] \| 2011 Revolving Credit Facility [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					5.00%
2011 Credit Facility [Member] \| 2011 Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					3.00%
2011 Credit Facility [Member] \| 2011 Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.00%
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			1,450,000,000
Credit Facility amended, effective date																Mar. 16, 2018
Deferred financing costs			$ 22,600,000
Credit facility, amount repaid	$ 1,178,100,000								1,178,100,000	$ 24,400,000	$ 24,400,000	24,400,000	$ 24,400,000
Long-term debt, weighted average interest rate																		6.79%
Borrowings under the senior secured credit facility																		$ 1,226,900,000
Foreign currency borrowings, outstanding																		0
Interest expense												24,400,000					59,600,000
Non-cash interest expense												1,200,000					3,000,000
Amortization of deferred financing costs												$ 1,000,000					$ 2,600,000
2017 Credit Facility [Member] \| Other Expense [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt									$ 35,400,000							$ 35,400,000
2017 Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			1.00%
2017 Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Base rate interest rate floor			1.75%
2017 Credit Facility [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			0.50%
2017 Credit Facility [Member] \| 2017 Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility, maturity date																Feb. 15, 2023
Outstanding principal amount			$ 1,300,000,000
Senior secured credit facility, discount percentage			2.00%
Senior secured credit facility, discount amount			$ 26,000,000
Borrowings under the senior secured credit facility																		1,226,900,000
2017 Credit Facility [Member] \| 2017 Term Loan B [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount																		1,190,200,000
Debt instrument, fair value																		1,226,100,000
2017 Credit Facility [Member] \| 2017 Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.50%
2017 Credit Facility [Member] \| 2017 Term Loan B [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			5.50%
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			$ 150,000,000
Credit facility, maturity date																Feb. 15, 2022
Repayment of prior senior secured credit facility	1,178,100,000
Credit facility LIBOR minimum floor rate interest			0.75%
Borrowings under the senior secured credit facility																		$ 0
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member] \| Base Rate [Member] \| Scenario Leverage Ratio One [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			3.50%
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member] \| Base Rate [Member] \| Scenario Leverage Ratio Two [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			3.75%
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member] \| Eurodollar [Member] \| Scenario Leverage Ratio One [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.50%
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member] \| Eurodollar [Member] \| Scenario Leverage Ratio Two [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.75%
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member] \| 2017 Term Loan B [Member]
Debt Instrument [Line Items]
Revolving credit facility termination date																Aug. 16, 2018
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount	1,250,000,000
Deferred financing costs	11,700,000
Line of credit facility, frequency of interest payments																quarterly
Long-term debt, weighted average interest rate									7.14%							7.14%
Borrowings under the senior secured credit facility									$ 1,000,000,000							$ 1,000,000,000
Foreign currency borrowings, outstanding									0							0
Interest expense									19,600,000							68,700,000
Non-cash interest expense									600,000							2,900,000
Amortization of deferred financing costs									700,000							$ 2,800,000
2018 Credit Facility [Member] \| Minimum [Member] \| 2019 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Outstanding principal amount	350,000,000
2018 Credit Facility [Member] \| Minimum [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Outstanding principal amount	$ 350,000,000
2018 Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	1.00%
2018 Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Base rate interest rate floor	1.00%
2018 Credit Facility [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	0.50%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member]
Debt Instrument [Line Items]
Credit facility, maturity date	Aug. 16, 2023
Outstanding principal amount	$ 250,000,000
Voluntary prepayment premium percentage																1.00%
Borrowings under the senior secured credit facility									250,000,000							$ 250,000,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									248,500,000							248,500,000
Debt instrument, fair value									253,000,000							$ 253,000,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2019 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date	Feb. 14, 2019
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	3.00%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	3.00%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility, maturity date	Aug. 18, 2025
Outstanding principal amount	$ 750,000,000
Senior secured credit facility, discount percentage	0.25%
Senior secured credit facility, discount amount	$ 1,900,000
Voluntary prepayment premium percentage																1.00%
Borrowings under the senior secured credit facility									750,000,000							$ 750,000,000
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									739,800,000							739,800,000
Debt instrument, fair value									758,900,000							758,900,000
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2019 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date	May 16, 2019
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date	Dec. 15, 2023
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.25%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	3.25%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount	$ 250,000,000
Credit facility, maturity date	Aug. 16, 2023
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Borrowings under the senior secured credit facility									$ 0							$ 0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| 2019 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date	Feb. 14, 2019
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.00%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.00%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of convertible senior notes issued	$ 400,000,000