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)	Jun. 30, 2017 USD ($)	Sep. 30, 2015 USD ($)	May 04, 2015 USD ($)	Feb. 15, 2017 USD ($)	Feb. 28, 2014 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2017 USD ($) d $ / shares	Sep. 30, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($)	Jul. 26, 2012 USD ($)	Mar. 09, 2011 USD ($)
Debt Instrument [Line Items]
Deferred financing costs			$ 6,200,000
Interest expense						$ 43,000,000			$ 24,000,000			$ 117,400,000	$ 74,600,000
Paid-in-capital in excess of par value						452,000,000						452,000,000		$ 467,600,000
Long-term debt						2,280,700,000						2,280,700,000		1,447,900,000
Convertible senior notes, carrying value of liability component						1,058,400,000						1,058,400,000		1,024,800,000
Letters of credit issued but undrawn						37,900,000						37,900,000
Prepaid forward share repurchase transactions [Member]
Debt Instrument [Line Items]
Paid-in-capital in excess of par value											$ 31,900,000
Forward share repurchase transactions amount					$ 685,800,000						685,800,000
Capped call transactions [Member]
Debt Instrument [Line Items]
Capped call transactions with financial institutions					123,800,000
Senior secured prior revolving credit facility [Member]
Debt Instrument [Line Items]
Credit facility, amount repaid						0		$ 410,000,000
Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Borrowings under the senior secured credit facility						0						0
Term Loan [Member]
Debt Instrument [Line Items]
Quarterly periodic payment, Principal	$ 24,400,000
Interest expense						23,900,000						58,500,000
Non-cash interest expense						1,200,000						3,000,000
Amortization of deferred financing costs						800,000						2,000,000
Term Loan [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Carrying amount of Term Loan						1,212,600,000						1,212,600,000
Debt instrument, fair value						1,228,000,000						1,228,000,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Deferred financing costs											26,600,000
Interest expense						17,200,000			16,400,000			50,900,000	48,700,000
Non-cash interest expense						10,400,000			9,700,000			30,600,000	28,700,000
Amortization of deferred financing costs						1,000,000			$ 900,000			3,000,000	$ 2,800,000
Carrying amount of Term Loan					1,150,000,000	$ 1,150,000,000						$ 1,150,000,000		1,150,000,000
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%
Convertible notes maturity					Aug. 15, 2019
Convertible notes, conversion feature												Holders of the 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 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 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 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 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
Minimum percentage of the product of common share price and conversion rate for convertible notes					98.00%
Convertible notes initial conversion rate					11.5908
Convertible notes initial conversion price \| $ / shares						$ 86.28			$ 86.28			$ 86.28	$ 86.28
Paid-in-capital in excess of par value					$ 219,100,000						5,100,000
Proceeds received from the issuance of the Convertible notes					1,150,000,000
Long-term debt					$ 930,900,000
Effective interest rate on convertible notes					6.20%
Unamortized debt discount and debt issuance costs						$ 91,600,000						$ 91,600,000		125,200,000
Convertible senior notes, carrying value of liability component						1,058,400,000						1,058,400,000		1,024,800,000
Fair value of liability to convertible notes						$ 1,064,600,000						$ 1,064,600,000		$ 961,300,000
Convertible Debt [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs											$ 21,500,000
Convertible Debt [Member] \| Capped call transactions [Member]
Debt Instrument [Line Items]
Convertible notes initial conversion price \| $ / shares					$ 86.28
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount				$ 1,450,000,000
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%
Deferred financing costs				$ 22,600,000
Senior secured credit facility, discount percentage				2.00%
Senior secured credit facility, discount amount				$ 26,000,000
Repayment of prior senior secured credit facility				$ 410,000,000
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						6.71%						6.71%		4.29%
Annual scheduled principal payments of debt, Remainder of 2017						$ 26,200,000						$ 26,200,000
Annual scheduled principal payments of debt, 2018						102,300,000						102,300,000
Annual scheduled principal payments of debt, 2019						1,250,000,000						1,250,000,000
Annual scheduled principal payments of debt, 2020						97,900,000						97,900,000
Annual scheduled principal payments of debt, 2021						97,500,000						97,500,000
Annual scheduled principal payments of debt, 2022						97,500,000						97,500,000
Annual scheduled principal payments of debt, 2023						739,400,000						$ 739,400,000
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		$ 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)
Borrowings under the senior secured credit facility														410,000,000
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] \| Prior Term Loan [Member]
Debt Instrument [Line Items]
Credit facility prepayments			$ 20,300,000
Credit facility, maximum amount															$ 500,000,000
Credit facility, amount repaid										$ 229,700,000
Senior Secured Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount				$ 1,300,000,000
Credit facility, maturity date												Feb. 15, 2023
Credit facility, amount repaid						24,400,000	$ 24,400,000
Borrowings under the senior secured credit facility						$ 1,251,200,000						$ 1,251,200,000
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]
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] \| 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%