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	9 Months Ended
Long-Term Debt - Additional Information (Detail)	Jul. 30, 2021 USD ($)	Feb. 10, 2021	Mar. 19, 2020 USD ($)	Dec. 12, 2019 USD ($)	Aug. 16, 2018 USD ($)	Jul. 30, 2021 USD ($)	May 31, 2021 USD ($)	May 31, 2020 USD ($)	Aug. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / shares	Sep. 30, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) Days $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Outstanding principal amount											$ 2,853,400,000						$ 2,853,400,000
Loss on extinguishment of debt																	24,600,000	$ 0
Borrowings under the senior secured credit facility											1,093,600,000						1,093,600,000		$ 976,500,000
Interest expense													$ 38,800,000	$ 37,000,000.0			115,500,000	96,400,000
Paid-in-capital in excess of par value											312,100,000						312,100,000		342,300,000
Long-term debt											2,762,700,000						2,762,700,000		2,428,400,000
Letters of credit issued but undrawn											39,900,000						39,900,000
2.625% Convertible Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Outstanding principal amount										$ 550,000,000.0		$ 550,000,000.0				$ 550,000,000.0			550,000,000.0
Deferred financing costs										12,900,000
Aggregate principal amount of convertible senior notes issued										$ 550,000,000.0
Interest expense											10,000,000.0			9,500,000			29,600,000	28,100,000
Non-cash interest expense											6,000,000.0			5,500,000			17,600,000	16,200,000
Amortization of deferred financing costs											$ 400,000			400,000			$ 1,200,000	1,100,000
Convertible notes, interest rate										2.625%	2.625%						2.625%
Convertible notes maturity										Mar. 15, 2024							May 15, 2024
Principal amount of convertible notes										$ 1,000							$ 1,000
Convertible notes conversion rate										16.0056							16.0467
Convertible notes conversion price \| $ / shares										$ 62.48	$ 62.32						$ 62.32
Paid-in-capital in excess of par value										$ 139,900,000
Long-term debt										$ 410,100,000
Effective interest rate on convertible notes										8.40%
Fair value of liability to convertible notes											$ 548,600,000						$ 548,600,000		541,800,000
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) \| Days																	20
Convertible notes, number of trading days of threshold limit in consecutive days \| Days																	30
Minimum percentage of common share price over conversion price for conversion										130.00%
Minimum percentage of the product of common share price and conversion rate for convertible notes										98.00%
Deferred financing costs recorded as additional paid-in-capital in excess of par value										$ 3,300,000
Unamortized debt discount and debt issuance costs											70,600,000						$ 70,600,000		89,400,000
Convertible senior notes, carrying value of liability component											479,400,000						479,400,000		460,600,000
2.625% Convertible Senior Notes Due 2024 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs										$ 9,600,000
7.875% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Outstanding principal amount											600,000,000.0						600,000,000.0		600,000,000.0
Deferred financing costs											6,200,000						6,200,000		7,100,000	$ 7,900,000
Aggregate principal amount of convertible senior notes issued								$ 600,000,000.0
Interest expense											12,100,000						36,400,000	16,400,000
Amortization of deferred financing costs											$ 400,000			300,000			$ 1,000,000.0	400,000
Convertible notes, interest rate								7.875%			7.875%						7.875%
Convertible notes maturity								Sep. 01, 2025									Sep. 01, 2025
Senior notes, redemption price, percentage								100.00%
Senior notes, redemption price percentage with equity offerings								107.875%
Carrying amount											$ 593,800,000						$ 593,800,000		592,900,000
7.875% Senior Notes Due 2025 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs																				$ 7,900,000
7.875% Senior Notes Due 2025 [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Fair value of notes																			656,300,000
7.875% Senior Notes Due 2025 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount of senior notes being redeemed								40.00%
7.250% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Outstanding principal amount																			400,000,000.0
Deferred financing costs																			4,100,000		$ 5,400,000
Aggregate principal amount of convertible senior notes issued									$ 400,000,000.0
Proceed to redeem senior notes							$ 400,000,000.0
Credit facility, amount borrowed							428,500,000
Loss on extinguishment of debt												(24,600,000)
Interest expense														7,400,000			11,500,000	22,200,000
Amortization of deferred financing costs														100,000			$ 200,000	400,000
Convertible notes, interest rate									7.25%		7.25%						7.25%
Convertible notes maturity									Aug. 15, 2026								Aug. 15, 2026
Accrued interest							7,700,000
Carrying amount																			395,900,000
Fair value of notes																			$ 425,000,000.0
7.250% Senior Notes Due 2026 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs																					$ 5,400,000
4.875% Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Outstanding principal amount											$ 600,000,000.0						$ 600,000,000.0
Deferred financing costs												7,700,000				7,700,000
Aggregate principal amount of convertible senior notes issued							$ 600,000,000.0
Interest expense											7,500,000						10,900,000
Amortization of deferred financing costs											$ 200,000						$ 300,000
Convertible notes, interest rate							4.875%				4.875%						4.875%
Convertible notes maturity							Jun. 01, 2029										Jun. 01, 2029
Unamortized debt discount and debt issuance costs											$ 7,400,000						$ 7,400,000
Senior notes, redemption price, percentage							100.00%
Senior notes, redemption price percentage with equity offerings							104.875%
Carrying amount											592,600,000						592,600,000
Fair value of notes											600,100,000						600,100,000
4.875% Senior Notes Due 2029 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs												$ 7,700,000				$ 7,700,000
4.875% Senior Notes Due 2029 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount of senior notes being redeemed							40.00%
Eurodollar [Member]
Debt Instrument [Line Items]
Base rate interest rate floor					0.00%
2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings under the senior secured credit facility											$ 150,000,000.0						150,000,000.0
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of prior senior secured credit facility					$ 1,178,100,000
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount					1,250,000,000
Commitment Fee Percentage						0.35%
Deferred financing costs				$ 1,200,000	11,700,000								$ 1,100,000
Credit facility, amount borrowed																	531,200,000	30,400,000
Credit facility, amount repaid																	$ 415,800,000	15,600,000
Long-term debt, weighted average interest rate											2.65%						2.65%		3.39%
Borrowings under the senior secured credit facility											$ 1,100,100,000						$ 1,100,100,000		$ 984,700,000
Interest expense											8,900,000			8,000,000.0			26,100,000	29,200,000
Non-cash interest expense											100,000			100,000			300,000	200,000
Amortization of deferred financing costs											900,000			$ 500,000			1,800,000	$ 1,400,000
2018 Credit Facility [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Outstanding principal amount			$ 350,000,000.0		$ 350,000,000.0
2018 Credit Facility [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Debt Modification Costs	$ 1,400,000		1,600,000			$ 1,400,000
Deferred financing costs			1,100,000								800,000						$ 800,000
Credit facility amendment date																	Mar. 19, 2020
Recognized in interest expense, net											600,000				$ 500,000
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] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					1.00%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount					$ 250,000,000.0
Borrowings under the senior secured credit facility											150,000,000.0						$ 150,000,000.0		0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%				0.25%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%				0.35%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Second Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			250,000,000.0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Second Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount											282,500,000						282,500,000
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Fourth Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount	$ 282,500,000					282,500,000
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Fourth Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount											330,000,000.0						$ 330,000,000.0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	1.75%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.25%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate																2.50%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	0.75%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	1.25%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate																	1.50%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Second Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate																	1.25%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member]
Debt Instrument [Line Items]
Outstanding principal amount					$ 250,000,000.0
Borrowings under the senior secured credit facility											282,600,000						$ 282,600,000		251,600,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount											281,600,000						281,600,000		250,500,000
Debt instrument, fair value											281,900,000						$ 281,900,000		251,900,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date																	Sep. 15, 2023
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Credit facility, maturity date																	Mar. 19, 2025
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Second Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			$ 234,400,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Second Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount											264,800,000						$ 264,800,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Fourth Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount	$ 245,000,000.0					$ 245,000,000.0
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Fourth Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount											286,200,000						$ 286,200,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Eurodollar [Member] \| Second Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					1.75%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Eurodollar [Member] \| Second Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate																	2.25%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Base Rate [Member] \| Second Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					0.75%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.50%		3.00%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	1.50%		2.00%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member]
Debt Instrument [Line Items]
Outstanding principal amount					$ 750,000,000.0
Credit facility, maturity date																	Aug. 18, 2025
Senior secured credit facility, discount percentage					0.25%
Senior secured credit facility, discount amount					$ 1,900,000
Credit facility, amount repaid																	$ 60,000,000.0
Borrowings under the senior secured credit facility											667,500,000						667,500,000		733,100,000
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount											662,000,000.0						662,000,000.0		726,000,000.0
Debt instrument, fair value											$ 665,800,000						$ 665,800,000		$ 734,000,000.0
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] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate		2.75%		2.75%	3.25%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Eurodollar [Member] \| Third Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate																2.50%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate		1.75%		1.75%	2.25%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Base Rate [Member] \| Third Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate																	1.50%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					2.50%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					1.50%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of convertible senior notes issued					$ 400,000,000.0