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					6 Months Ended
Long-Term Debt - Additional Information (Detail)	Apr. 24, 2018	Jun. 30, 2017 USD ($)	Feb. 15, 2017 USD ($)	Sep. 30, 2015 USD ($)	May 04, 2015 USD ($)	Mar. 31, 2018 USD ($) $ / shares	Feb. 28, 2014 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2014 USD ($)	Jun. 30, 2018 USD ($) Day d $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jul. 26, 2012 USD ($)	Mar. 09, 2011 USD ($)
Debt Instrument [Line Items]
Deferred financing costs					$ 6,200,000
Outstanding principal amount								$ 2,410,700,000					$ 2,410,700,000
Interest expense								49,100,000			$ 41,900,000		93,700,000	$ 74,400,000
Stock split conversion ratio	2						2
Paid-in-capital in excess of par value								389,400,000					389,400,000		$ 407,300,000
Long-term debt								2,200,700,000					2,200,700,000		2,268,100,000
Convertible notes paid													582,500,000
Letters of credit issued but undrawn								37,500,000					37,500,000
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]
Deferred financing costs												26,600,000
Outstanding principal amount							1,150,000,000	675,000,000					675,000,000		1,150,000,000
Interest expense								10,400,000		$ 17,000,000			27,400,000	33,700,000
Non-cash interest expense								6,400,000		10,200,000			16,800,000	20,200,000
Amortization of deferred financing costs								$ 600,000		1,000,000			$ 1,600,000	2,000,000
Aggregate principal amount of convertible senior notes issued							1,000,000,000
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								$ 637,700,000					$ 637,700,000		1,066,000,000
Unamortized debt discount and debt issuance costs								33,000,000					33,000,000		80,000,000
Convertible senior notes, carrying value of liability component								642,000,000					642,000,000		1,070,000,000
Convertible Senior Notes Due 2019 [Member] \| Repurchase of 2019 Convertible Notes [Member]
Debt Instrument [Line Items]
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
Loss on extinguishment of debt						13,100,000							13,100,000
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]
Deferred financing costs						12,900,000			12,900,000
Outstanding principal amount								550,000,000					550,000,000
Interest expense								8,500,000					9,300,000
Non-cash interest expense								4,500,000					5,000,000
Amortization of deferred financing costs								$ 300,000					$ 300,000
Aggregate principal amount of convertible senior notes issued						$ 550,000,000			$ 550,000,000
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								$ 423,200,000					$ 423,200,000
Unamortized debt discount and debt issuance costs								144,200,000					144,200,000
Convertible senior notes, carrying value of liability component								405,800,000					$ 405,800,000
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 secured prior revolving credit facility [Member]
Debt Instrument [Line Items]
Repayment of prior senior secured credit facility			$ 410,000,000
Credit facility, amount repaid											$ 410,000,000
Prior Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility amendment date													May 04, 2015
Credit facility interest rate description													After March 9, 2016, the applicable interest rates on the Company’s borrowings under the Prior Credit Facility increased by 2.00% such that borrowings under the Prior Credit Facility began bearing interest at either LIBOR plus the applicable margin between 4.00% and 5.00% or the base rate plus the applicable margin between 3.00% and 4.00%
Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Borrowings under the senior secured credit facility								0					$ 0		0
Term Loan [Member]
Debt Instrument [Line Items]
Quarterly periodic payment, Principal		$ 24,400,000
Interest expense								24,500,000		23,400,000			48,200,000	34,600,000
Non-cash interest expense								1,200,000		1,200,000			2,300,000	1,800,000
Amortization of deferred financing costs								700,000		800,000			1,500,000	$ 1,200,000
Term Loan [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount								1,145,300,000					1,145,300,000		1,190,200,000
Debt instrument, fair value								$ 1,189,200,000					$ 1,189,200,000		$ 1,226,100,000
Base Rate [Member] \| Senior secured prior revolving credit facility [Member]
Debt Instrument [Line Items]
Variable rate basis													Facility increased by 2.00% such that borrowings under the Prior Credit Facility began bearing interest at either LIBOR plus the applicable margin between 4.00% and 5.00% or the base rate plus the applicable margin between 3.00% and 4.00%
Base rate interest rate floor			1.75%
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			$ 1,450,000,000
Deferred financing costs			$ 22,600,000
Credit Facility amended, effective date													Mar. 16, 2018
Senior secured credit facility, discount percentage			2.00%
Senior secured credit facility, discount amount			$ 26,000,000
Line of credit facility, frequency of interest payments			quarterly
Amount required to maintain on consolidated cash and cash equivalents													$ 200,000,000
Long-term debt, weighted average interest rate								7.34%					7.34%		6.79%
Credit facility, amount repaid								$ 24,400,000	$ 24,400,000	$ 24,400,000
Borrowings under the senior secured credit facility								1,145,300,000					$ 1,145,300,000		$ 1,190,200,000
Senior Secured Credit Facility [Member] \| Senior secured prior revolving credit facility [Member]
Debt Instrument [Line Items]
Line of credit facility extended maturity period													1 year
Credit facility prepayments					50,900,000
Credit facility, maximum amount								425,000,000					$ 425,000,000				$ 700,000,000
Amended maturity date of credit facility													Mar. 09, 2017
Decreased amount in credit facility borrowing capacity				$ (39,100,000)	(235,900,000)
Foreign currency borrowings, outstanding								0					$ 0		0
Senior Secured Credit Facility [Member] \| Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			$ 150,000,000
Credit facility, maturity date													Feb. 15, 2022
Credit facility LIBOR minimum floor rate interest			0.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.50%
Senior Secured Credit Facility [Member] \| Senior secured revolving credit facility [Member] \| 2019 Convertible Notes Exceeds 250 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date													Feb. 14, 2019
Senior Secured Credit Facility [Member] \| Minimum [Member] \| 2019 Convertible Notes Exceeds 250 Million [Member]
Debt Instrument [Line Items]
Outstanding principal amount			$ 250,000,000
Senior Secured Credit Facility [Member] \| Prior Term Loan [Member]
Debt Instrument [Line Items]
Credit facility prepayments					$ 20,300,000
Credit facility, maximum amount																$ 500,000,000
Senior Secured Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Outstanding principal amount			$ 1,300,000,000
Credit facility, maturity date													Feb. 15, 2023
Borrowings under the senior secured credit facility								$ 1,178,100,000					$ 1,178,100,000		$ 1,226,900,000
Senior Secured Credit Facility [Member] \| Term Loan [Member] \| 2019 Convertible Notes Exceeds 250 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date													May 16, 2019
Senior Secured Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			1.00%
Senior Secured Credit Facility [Member] \| LIBOR [Member] \| Senior secured prior revolving credit facility [Member]
Debt Instrument [Line Items]
Credit facility LIBOR minimum floor rate interest					0.25%
Senior Secured Credit Facility [Member] \| Base Rate [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.50%
Senior Secured Credit Facility [Member] \| Eurodollar [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			5.50%
Senior Secured Credit Facility [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			0.50%
Until March 9, 2016 [Member] \| Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate increase by percentage					0.50%
After March 9, 2016 [Member] \| Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate increased by percentage					2.00%
After March 9, 2016 [Member] \| Senior Secured Credit Facility [Member] \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.00%
After March 9, 2016 [Member] \| Senior Secured Credit Facility [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					5.00%
After March 9, 2016 [Member] \| Senior Secured Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					3.00%
After March 9, 2016 [Member] \| Senior Secured Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.00%
Until August 15, 2017 [Member] \| Senior Secured Credit Facility [Member] \| Base Rate [Member] \| Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			3.75%
Until August 15, 2017 [Member] \| Senior Secured Credit Facility [Member] \| Eurodollar [Member] \| Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.75%
Scenario Leverage Ratio One [Member] \| Senior Secured Credit Facility [Member] \| Base Rate [Member] \| Senior secured revolving credit facility [Member] \| After August 15, 2017 [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			3.50%
Scenario Leverage Ratio One [Member] \| Senior Secured Credit Facility [Member] \| Eurodollar [Member] \| Senior secured revolving credit facility [Member] \| After August 15, 2017 [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.50%
Scenario Leverage Ratio Two [Member] \| Senior Secured Credit Facility [Member] \| Base Rate [Member] \| Senior secured revolving credit facility [Member] \| After August 15, 2017 [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			3.75%
Scenario Leverage Ratio Two [Member] \| Senior Secured Credit Facility [Member] \| Eurodollar [Member] \| Senior secured revolving credit facility [Member] \| After August 15, 2017 [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate			4.75%