WW International (WW) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 28, 2019	Oct. 30, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 28, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	WW
Entity Registrant Name	WW INTERNATIONAL, INC.
Entity Central Index Key	0000105319
Current Fiscal Year End Date	--12-28
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		67,321,634
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-16769
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	11-6040273
Entity Address, Address Line One	675 Avenue of the Americas
Entity Address, Address Line Two	6th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10010
City Area Code	212
Local Phone Number	589-2700
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 239,162	$ 236,974
Receivables (net of allowances: September 28, 2019 - $1,731 and December 29, 2018 - $1,743)	30,570	27,247
Inventories	25,227	25,851
Prepaid income taxes	9,534	33,997
Prepaid expenses and other current assets	25,397	42,355
TOTAL CURRENT ASSETS	329,890	366,424
Property and equipment, net	49,900	52,202
Operating lease assets	146,063	0
Franchise rights acquired	751,593	751,134
Goodwill	152,806	152,519
Other intangible assets, net	58,817	57,162
Deferred income taxes	14,794	16,230
Other noncurrent assets	12,580	18,870
TOTAL ASSETS	1,516,443	1,414,541
CURRENT LIABILITIES
Portion of long-term debt due within one year	77,000	77,000
Portion of operating lease liabilities due within one year	32,372	0
Accounts payable	26,911	27,098
Salaries and wages payable	57,906	64,600
Accrued marketing and advertising	9,040	14,052
Accrued interest	28,155	28,651
Other accrued liabilities	42,216	48,218
Derivative payable	24,280	5,578
Income taxes payable	8,837	22,618
Deferred revenue	59,069	53,501
TOTAL CURRENT LIABILITIES	365,786	341,316
Long-term debt, net	1,566,692	1,669,708
Long-term operating lease liabilities	123,541	0
Deferred income taxes	178,153	190,258
Other	2,212	18,289
TOTAL LIABILITIES	2,236,384	2,219,571
Redeemable noncontrolling interest	3,661	3,913
TOTAL DEFICIT
Common stock, $0 par value; 1,000,000 shares authorized; 120,352 shares issued at September 28, 2019 and December 29, 2018	0	0
Treasury stock, at cost, 53,046 shares at September 28, 2019 and 53,396 shares at December 29, 2018	(3,162,776)	(3,175,624)
Retained earnings	2,471,238	2,382,438
Accumulated other comprehensive loss	(32,064)	(15,757)
TOTAL DEFICIT	(723,602)	(808,943)
TOTAL LIABILITIES AND TOTAL DEFICIT	$ 1,516,443	$ 1,414,541

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Statement Of Financial Position [Abstract]
Receivables, allowances	$ 1,731	$ 1,743
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	120,352,000	120,352,000
Treasury stock, shares	53,046,000	53,396,000

CONSOLIDATED STATEMENTS OF NET

CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Revenues, net	$ 348,567	$ 365,765	$ 1,080,754	$ 1,183,735
Cost of revenues	153,798	150,371	469,223	502,546
Gross profit	194,769	215,394	611,531	681,189
Marketing expenses	36,327	35,515	200,543	189,855
Selling, general and administrative expenses	63,713	61,019	188,889	182,696
Operating income	94,729	118,860	222,099	308,638
Interest expense	33,118	35,506	103,045	107,238
Other expense, net	1,460	881	2,201	1,978
Income before income taxes	60,151	82,473	116,853	199,422
Provision for income taxes	13,123	12,374	26,834	19,580
Net income	47,028	70,099	90,019	179,842
Net loss attributable to the noncontrolling interest	58	33	214	122
Net income attributable to WW International, Inc.	$ 47,086	$ 70,132	$ 90,233	$ 179,964
Earnings Per Share attributable to WW International, Inc.
Basic	$ 0.70	$ 1.05	$ 1.34	$ 2.72
Diluted	$ 0.68	$ 1	$ 1.30	$ 2.57
Weighted average common shares outstanding
Basic	67,298	66,701	67,129	66,074
Diluted	69,617	70,331	69,364	70,117
Service
Revenues, net	$ 298,041	$ 311,963	$ 918,535	$ 984,362
Cost of revenues	122,374	122,357	373,452	390,296
Product and Other
Revenues, net	50,526	53,802	162,219	199,373
Cost of revenues	$ 31,424	$ 28,014	$ 95,771	$ 112,250

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 47,028	$ 70,099	$ 90,019	$ 179,842
Other comprehensive (loss) gain:
Foreign currency translation (loss) gain	(2,983)	1,534	532	(5,695)
Income tax benefit (expense) on foreign currency translation (loss) gain	757	(390)	(135)	1,443
Foreign currency translation (loss) gain, net of taxes	(2,226)	1,144	397	(4,252)
(Loss) gain on derivatives	(4,251)	2,904	(22,431)	15,201
Income tax benefit (expense) on (loss) gain on derivatives	1,078	(736)	5,689	(3,855)
(Loss) gain on derivatives, net of taxes	(3,173)	2,168	(16,742)	11,346
Total other comprehensive (loss) gain	(5,399)	3,312	(16,345)	7,094
Comprehensive income	41,629	73,411	73,674	186,936
Net loss attributable to the noncontrolling interest	58	33	214	122
Foreign currency translation loss, net of taxes attributable to the noncontrolling interest	44	33	38	406
Comprehensive loss attributable to the noncontrolling interest	102	66	252	528
Comprehensive income attributable to WW International, Inc.	$ 41,731	$ 73,477	$ 73,926	$ 187,464

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN TOTAL DEFICIT - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Noncontrolling Interest	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning Balance at Dec. 30, 2017	$ (1,015,986)	$ 4,467	$ 0	$ (3,208,836)	$ (10,467)	$ 2,203,317
Beginning balance (in shares) at Dec. 30, 2017			118,947	54,258
Comprehensive income (loss)	187,464	(528)			7,500	179,964
Issuance of treasury stock under stock plans	4,647			$ 28,821		(24,174)
Issuance of treasury stock under stock plans (in shares)				(741)
Compensation expense on share- based awards	15,346					15,346
Issuance of common stock	9,796					9,796
Issuance of common stock (in shares)			1,405
Cumulative effect of revenue accounting change	2,933					2,933
Cumulative effect of tax accounting change	(49,412)				(2,485)	(46,927)
Ending balance at Sep. 29, 2018	(845,212)	3,939	$ 0	$ (3,180,015)	(5,452)	2,340,255
Ending balance (in shares) at Sep. 29, 2018			120,352	53,517
Beginning Balance at Jun. 30, 2018	(927,000)	4,005	$ 0	$ (3,189,796)	(8,797)	2,271,593
Beginning balance (in shares) at Jun. 30, 2018			120,352	53,765
Comprehensive income (loss)	73,477	(66)			3,345	70,132
Issuance of treasury stock under stock plans	2,640			$ 9,781		(7,141)
Issuance of treasury stock under stock plans (in shares)				(248)
Compensation expense on share- based awards	5,671					5,671
Issuance of common stock	0
Ending balance at Sep. 29, 2018	(845,212)	3,939	$ 0	$ (3,180,015)	(5,452)	2,340,255
Ending balance (in shares) at Sep. 29, 2018			120,352	53,517
Beginning Balance at Dec. 29, 2018	(808,943)	3,913	$ 0	$ (3,175,624)	(15,757)	2,382,438
Beginning balance (in shares) at Dec. 29, 2018			120,352	53,396
Comprehensive income (loss)	73,926	(252)			(16,307)	90,233
Issuance of treasury stock under stock plans	(3,512)			$ 12,848		(16,360)
Issuance of treasury stock under stock plans (in shares)				(350)
Compensation expense on share- based awards	14,927					14,927
Ending balance at Sep. 28, 2019	(723,602)	3,661	$ 0	$ (3,162,776)	(32,064)	2,471,238
Ending balance (in shares) at Sep. 28, 2019			120,352	53,046
Beginning Balance at Jun. 29, 2019	(770,160)	3,763	$ 0	$ (3,164,409)	(26,709)	2,420,958
Beginning balance (in shares) at Jun. 29, 2019			120,352	53,089
Comprehensive income (loss)	41,731	(102)			(5,355)	47,086
Issuance of treasury stock under stock plans	(416)			$ 1,633		(2,049)
Issuance of treasury stock under stock plans (in shares)				(43)
Compensation expense on share- based awards	5,243					5,243
Ending balance at Sep. 28, 2019	$ (723,602)	$ 3,661	$ 0	$ (3,162,776)	$ (32,064)	$ 2,471,238
Ending balance (in shares) at Sep. 28, 2019			120,352	53,046

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Operating activities:
Net income	$ 90,019	$ 179,842
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	33,543	32,594
Amortization of deferred financing costs and debt discount	6,876	6,330
Impairment of intangible and long-lived assets	0	3
Share-based compensation expense	14,927	15,346
Deferred tax (benefit) provision	(5,631)	1,322
Allowance for doubtful accounts	(140)	(68)
Reserve for inventory obsolescence	6,898	6,146
Foreign currency exchange rate loss	1,793	1,480
Changes in cash due to:
Receivables	944	(12,763)
Inventories	(6,064)	11,888
Prepaid expenses	33,299	2,535
Accounts payable	1,337	(2,024)
Accrued liabilities	(17,812)	16,634
Deferred revenue	5,535	(12,465)
Other long term assets and liabilities, net	(1,114)	(12,819)
Income taxes	(12,729)	20,658
Cash provided by operating activities	151,681	254,639
Investing activities:
Capital expenditures	(10,479)	(11,932)
Capitalized software expenditures	(24,082)	(20,115)
Cash paid for acquisitions	0	(3,063)
Other items, net	244	(9,843)
Cash used for investing activities	(34,317)	(44,953)
Financing activities:
Net payments on revolver	0	(25,000)
Payments on long-term debt	(107,750)	(57,750)
Taxes paid related to net share settlement of equity awards	(4,796)	(20,564)
Proceeds from stock options exercised	475	32,610
Other items, net	(350)	0
Cash used for financing activities	(112,421)	(70,704)
Effect of exchange rate changes on cash and cash equivalents	(2,755)	(2,266)
Net increase in cash and cash equivalents	2,188	136,716
Cash and cash equivalents, beginning of period	236,974	83,054
Cash and cash equivalents, end of period	$ 239,162	$ 219,770

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 28, 2019
Accounting Policies [Abstract]
Basis of Presentation	1. The accompanying consolidated financial statements include the accounts of WW International, Inc. and all of its subsidiaries. The terms “Company” and “WW” as used throughout these notes are used to indicate WW International, Inc. and all of its operations consolidated for purposes of its financial statements. The Company’s “Digital” business refers to providing subscriptions to the Company’s digital product offerings, including the Personal Coaching + Digital product. The Company’s “Studio + Digital” business refers to providing access to the Company’s weekly in-person workshops combined with the Company’s digital subscription product offerings to commitment plan subscribers. The “Studio + Digital” business also includes the provision of access to workshops for members who do not subscribe to commitment plans, including the Company’s The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and include amounts that are based on management’s best estimates and judgments. While all available information has been considered, actual amounts could differ from those estimates. The consolidated financial statements include all of the Company’s majority-owned subsidiaries. All entities acquired, and any entity of which a majority interest was acquired, are included in the consolidated financial statements from the date of acquisition. All intercompany accounts and transactions have been eliminated in consolidation. The Company’s operating results for any interim period are not necessarily indicative of future or annual results. The consolidated financial statements are unaudited and, accordingly, they do not include all of the information necessary for a comprehensive presentation of results of operations, financial position and cash flow activity required by GAAP for complete financial statements but, in the opinion of management, reflect all adjustments including those of a normal recurring nature necessary for a fair statement of the interim results presented. These statements should be read in conjunction with the Company’s Annual Report on Form 10-K for fiscal 2018 filed on February 26, 2019, which includes additional information about the Company, its results of operations, its financial position and its cash flows.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	9 Months Ended
	Sep. 28, 2019
Accounting Changes And Error Corrections [Abstract]
Recently Issued Accounting Standards	2. For a discussion of the Company’s significant accounting policies, see “Summary of Significant Accounting Policies” in the Notes to Consolidated Financial Statements of the Company’s Annual Report on Form 10-K for fiscal 2018. For a discussion of accounting standards adopted in the current period, see Note 3.

Accounting Standards Adopted in

Accounting Standards Adopted in Current Year	9 Months Ended
	Sep. 28, 2019
Accounting Changes And Error Corrections [Abstract]
Accounting Standards Adopted in Current Year	3. In February 2016, the Financial Accounting Standards Board (the “FASB”) issued updated guidance regarding leases, requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but will be updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The effective date of the new guidance for public companies is for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. In July 2018, the FASB issued updated guidance by providing an entity with an additional and optional transition method to adopt the new lease guidance. On December 30, 2018, the Company adopted the updated lease guidance on a modified retrospective basis as of the adoption date. Periods prior to the adoption date continue to be reported under the historical lease accounting guidance. See Note 4 for further details.

Leases

Leases	9 Months Ended
	Sep. 28, 2019
Leases [Abstract]
Leases	4. Leases Adoption of Lease Standard On December 30, 2018, the Company adopted the updated guidance on leases using the modified retrospective transition method. Results for reporting periods beginning on or after December 30, 2018 are presented under the updated guidance, while prior period amounts are not adjusted and continue to be reported in accordance with the Company’s historical lease accounting. The adoption of the standard had a material impact on the Company’s consolidated balance sheets but did not have a material impact on its consolidated statements of net income. The Company recorded $155,178 as a right of use asset, $163,486 of lease liabilities and $0 for retained earnings for operating leases upon adoption of the updated guidanc e. The amounts previously reported in the first quarter of 2019 have been revised by $ 3,595 due to the impact of prepaid rent. The standard did not have a material impact on the Company’s finance lease contracts. A lease is defined as an arrangement that contractually specifies the right to use and control an identified asset for a specific period of time in exchange for consideration. Operating leases are included in operating lease assets, portion of operating lease liabilities due within one year, and long-term operating lease liabilities in the Company’s 2019 consolidated balance sheet. Finance leases are included in property and equipment, net, other accrued liabilities, and other long-term liabilities in the Company’s 2019 consolidated balance sheet L September 28, 2019 The Company’s operating and finance leases are primarily for its studios, corporate offices, data centers and certain equipment, including automobiles. At September 28, 2019, the Company’s lease assets and lease liabilities were as follows: September 28, 2019 Assets: Operating lease assets $ 146,063 Finance lease assets 384 Total leased assets $ 146,447 Liabilities: Current Operating $ 32,372 Finance 200 Noncurrent Operating $ 123,541 Finance 126 Total lease liabilities $ 156,239 For the three and nine months ended September 28, 2019, the components of the Company’s lease expense were as follows: Three Months Ended Nine Months Ended September 28, September 28, 2019 2019 Operating lease cost $ 12,906 $ 38,641 Finance lease cost: Amortization of leased assets 132 350 Interest on lease liabilities 4 17 Total finance lease cost $ 136 $ 367 Total lease cost $ 13,042 $ 39,008 At September 28, 2019, the Company’s weighted average remaining lease term and weighted average discount rates were as follows: September 28, 2019 Weighted Average Remaining Lease Term (years) Operating leases 7.19 Finance leases 2.10 Weighted Average Discount Rate Operating leases 7.01 Finance leases 5.22 The Company’s leases have remaining lease terms of 0 to 13 years with a weighted average lease term of 7.18 years. At September 28, 2019, the maturity of the Company’s lease liabilities in each of the next five fiscal years and thereafter were as follows: Operating Leases Finance Leases Total Remainder of fiscal 2019 $ 8,614 $ 103 $ 8,717 2020 43,801 133 43,934 2021 35,194 50 35,244 2022 24,228 22 24,250 2023 16,858 24 16,882 Thereafter 75,700 5 75,705 Total lease payments $ 204,395 $ 337 $ 204,732 Less imputed interest 48,482 11 48,493 Present value of lease liabilities $ 155,913 $ 326 $ 156,239 Minimum commitments under non-cancelable obligations, primarily for office and rental facilities operating leases, at December 29, 2018, consisted of the following: 2019 $ 63,261 2020 38,491 2021 22,341 2022 14,017 2023 9,192 2024 and thereafter 37,704 Total $ 185,006 Total rent expense charged to operations for office and rental facilities under these operating leases for the three and nine months ended September 29, 2018 was $10,837 and $ Supplemental cash flow information related to leases for the nine months ended September 28, 2019 were as follows: Nine Months Ended September 28, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 38,664 Operating cash flows from finance leases $ 17 Financing cash flows from finance leases $ 350 Leased assets obtained in exchange for new operating lease liabilities $ 26,270 Leased assets obtained in exchange for new finance lease liabilities $ 105 Practical Expedients and Accounting Policy Elections The Company elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed the Company not to reassess whether any expired or existing contracts contained leases, to carry forward existing lease classifications and not to reassess initial direct costs for existing leases. In addition, the Company elected the benefit of hindsight practical expedient in determining the lease term for existing leases upon adoption of the updated guidance. The Company has lease agreements with lease and non-lease components and has elected the practical expedient not to separate non-lease components from lease components and instead to account for each separate lease component and non-lease component as a single lease component. The Company has elected the short-term lease exception accounting policy, whereby the recognition requirements of the updated guidance is not applied and lease expense is recorded on a straight-line basis with respect to leases with an initial term of 12 months or less.

Revenue

Revenue	9 Months Ended
	Sep. 28, 2019
Revenue From Contract With Customer [Abstract]
Revenue	5 . Revenue Adoption of Revenue from Contracts with Customers On December 31, 2017, the Company adopted the updated guidance on revenue from contracts with customers using the modified retrospective method applied to those contracts which were not completed as of December 31, 2017. Results for reporting periods beginning after December 31, 2017 are presented under the updated guidance, while prior period amounts are not adjusted and continue to be reported in accordance with the Company’s historical revenue accounting. The Company recorded a net increase to opening retained earnings of $2,145 as of December 31, 2017 due to the cumulative impact of adopting the updated guidance, inclusive of a $3,501 decrease to deferred revenue, a decrease of $568 to prepaid expenses and other current assets and an increase to the deferred income tax liability of $788. Revenue Recognition Revenues are recognized when control of the promised services or goods is transferred to the Company’s customers, in an amount that reflects the consideration it expects to be entitled to in exchange for those services or goods. The Company earns revenue from subscriptions for its digital products and by conducting workshops, for which it charges a fee, predominantly through commitment plans, prepayment plans or the “pay-as-you-go” arrangement. The Company also earns revenue by selling consumer products (including publications) in its workshops, online through its ecommerce platform and to its franchisees, collecting commissions from franchisees, collecting royalties related to licensing agreements, selling magazine subscriptions, publishing, selling advertising space on its websites and in copies of its publications and By Mail product sales. Commitment plan revenues, prepaid workshop fees and magazine subscription revenue are recorded to deferred revenue and amortized into revenue as control is transferred over the period earned since these performance obligations are satisfied over time. Digital Subscription Revenues, consisting of the fees associated with subscriptions for the Company’s Digital products, including its Personal Coaching + Digital product, are deferred and recognized on a straight-line basis as control is transferred over the subscription period. One-time Digital sign-up fees are considered immaterial in the context of the contract and the related revenue is recorded to deferred revenue and amortized into revenue over the commitment period. In the Studio + Digital business, the Company generally charges non-refundable registration and starter fees in exchange for access to the Company’s digital subscription products, an introductory information session and materials it provides to new members. Revenue from these registration and starter fees is considered immaterial in the context of the contract and is recorded to deferred revenue and a mortized into revenue over the commitment period. Revenue from “pay-as-you-go” workshop fees, consumer product sales and By Mail, commissions and royalties is recognized at the point in time control is transferred, which is when services are rendered, products are shipped to customers and title and risk of loss passes to the customers, and commissions and royalties are earned, respectively . Revenue from advertising in magazines and from magazine sales is recognized upon distribution of the magazine. For revenue transactions that involve multiple performance obligations, the amount of revenue recognized is determined using the relative fair value approach, which is generally based on each performance obligation’s stand-alone selling price. Discounts to customers, including free registration offers, are recorded as a deduction from gross revenue in the period such revenue was recognized. Revenue from advertising on its websites is recognized when the advertisement is viewed by the user. The Company grants refunds in aggregate amounts that historically have not been material. Because the period of payment of the refund generally approximates the period revenue was originally recognized, refunds are recorded as a reduction of revenue over the same period. The following table presents the Company’s revenues disaggregated by revenue source: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 Digital Subscription Revenues $ 153,940 $ 143,299 $ 459,764 $ 432,863 Studio + Digital Fees 144,101 168,664 458,771 551,499 Service Revenues, net $ 298,041 $ 311,963 $ 918,535 $ 984,362 Product sales and other, net 50,526 53,802 162,219 199,373 Revenues, net $ 348,567 $ 365,765 $ 1,080,754 $ 1,183,735 The following tables present the Company’s revenues disaggregated by revenue source and segment: Three Months Ended September 28, 2019 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 101,579 $ 42,230 $ 6,608 $ 3,523 $ 153,940 Studio + Digital Fees 108,338 20,644 10,733 4,386 144,101 Service Revenues, net $ 209,917 $ 62,874 $ 17,341 $ 7,909 $ 298,041 Product sales and other, net 33,767 8,264 5,592 2,903 50,526 Revenues, net $ 243,684 $ 71,138 $ 22,933 $ 10,812 $ 348,567 Three Months Ended September 29, 2018 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 95,664 $ 37,928 $ 6,282 $ 3,425 $ 143,299 Studio + Digital Fees 125,282 25,441 12,619 5,322 168,664 Service Revenues, net $ 220,946 $ 63,369 $ 18,901 $ 8,747 $ 311,963 Product sales and other, net 34,335 9,025 6,455 3,987 53,802 Revenues, net $ 255,281 $ 72,394 $ 25,356 $ 12,734 $ 365,765 Nine Months Ended September 28, 2019 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 303,190 $ 125,999 $ 20,019 $ 10,556 $ 459,764 Studio + Digital Fees 342,896 68,274 33,493 14,108 458,771 Service Revenues, net $ 646,086 $ 194,273 $ 53,512 $ 24,664 $ 918,535 Product sales and other, net 103,255 30,350 18,556 10,058 162,219 Revenues, net $ 749,341 $ 224,623 $ 72,068 $ 34,722 $ 1,080,754 Nine Months Ended September 29, 2018 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 289,002 $ 113,431 $ 19,800 $ 10,630 $ 432,863 Studio + Digital Fees 408,200 83,923 41,552 17,824 551,499 Service Revenues, net $ 697,202 $ 197,354 $ 61,352 $ 28,454 $ 984,362 Product sales and other, net 121,805 39,164 23,498 14,906 199,373 Revenues, net $ 819,007 $ 236,518 $ 84,850 $ 43,360 $ 1,183,735 Information about Contract Balances For Service Revenues, the Company typically collects payment in advance of providing services. Any amounts collected in advance of services being provided are recorded in deferred revenue. In the case where amounts are not collected, but the service has been provided and the revenue has been recognized, the amounts are recorded in accounts receivable. The opening and ending balances of the Company’s deferred revenues are as follows: Deferred Deferred Revenue Revenue-Long Term Balance as of December 29, 2018 $ 53,501 $ 961 Net increase (decrease) during the period 5,568 (717 ) Balance as of September 28, 2019 $ 59,069 $ 244 Revenue recognized from amounts included in current deferred revenue as of December 29, 2018 was $53,137 for the nine months ended September 28, 2019. The Company’s long-term deferred revenue, which is included in other liabilities on the Company’s consolidated balance sheet, had a balance of $244 at September 28, 2019 related to upfront payments received as an inducement for entering into certain sales-based royalty agreements with third party licensees. This revenue is amortized on a straight-line basis over the term of the applicable agreement. Practical Expedients and Exemptions The Company elected to apply the updated guidance only to contracts that were not completed as of December 31, 2017, the date of adoption. The Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. The Company expenses sales commissions when incurred (amortization period would have been one year or less) and these expenses are recorded within selling, general and administrative expenses. The Company treats shipping and handling fees as fulfillment costs and not as a separate performance obligation, and as a result, any fees received from

Acquisition of Kurbo Health, In

Acquisition of Kurbo Health, Inc.	9 Months Ended
	Sep. 28, 2019
Business Combinations [Abstract]
Acquisition of Kurbo Health, Inc.	6. Acquisition of Kurbo Health, Inc. On August 10, 2018, the Company acquired substantially all of the assets of Kurbo Health, Inc. (“Kurbo”), a family-based healthy lifestyle coaching program, for a net purchase price of $3,063. Payment was in the form of cash. The total purchase price of Kurbo has been allocated to goodwill ($1,101), website development ($1,916), prepaid expenses ($78) and other assets ($32) partially offset by deferred revenue ($ 57 ) and other liabilities ($ 7 ). The acquisition of Kurbo has been accounted for under the purchase method of accounting and, accordingly, earnings of Kurbo have been included in the consolidated operating results of the Company since the date of acquisition. The goodwill will be deductible annually for tax purposes.

Franchise Rights Acquired, Good

Franchise Rights Acquired, Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 28, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Franchise Rights Acquired, Goodwill and Other Intangible Assets	7 . Franchise Rights Acquired, Goodwill and Other Intangible Assets Franchise rights acquired are due to acquisitions of the Company’s franchised territories as well as the acquisition of franchise promotion agreements and other factors associated with the acquired franchise territories. For the nine months ended September 28, 2019, the change in the carrying value of franchise rights acquired is due to the effect of exchange rate changes. Goodwill primarily relates to the acquisition of the Company by The Kraft Heinz Company (successor to H.J. Heinz Company) in 1978 and the Company’s acquisitions of WW.com, Inc. (formerly known as WeightWatchers.com, Inc.) in 2005, the Company’s franchised territories and the majority interest in Vigilantes do Peso Marketing Ltda. For the nine months ended September 28, 2019, the change in the carrying amount of goodwill was due to the effect of exchange rate changes as follows: North Continental United America Europe Kingdom Other Total Balance as of December 29, 2018 $ 138,156 $ 7,242 $ 1,178 $ 5,943 $ 152,519 Effect of exchange rate changes 1,142 (459 ) (38 ) (358 ) 287 Balance as of September 28, 2019 $ 139,298 $ 6,783 $ 1,140 $ 5,585 $ 152,806 Goodwill and Franchise Rights Acquired Annual Impairment Test The Company reviews goodwill and other indefinite-lived intangible assets, including franchise rights acquired with indefinite lives, for potential impairment on at least an annual basis or more often if events so require. The Company performed fair value impairment testing as of May 5, 2019 and May 6, 2018, each the first day of fiscal May, on its goodwill and other indefinite-lived intangible assets. In performing its annual impairment analysis as of May 5, 2019 and May 6, 2018, the Company determined that the carrying amounts of its goodwill reporting units and franchise rights acquired with indefinite lives units of account did not exceed their respective fair values and therefore no impairment existed. When determining fair value, the Company utilizes various assumptions, including projections of future cash flows, growth rates and discount rates. A change in these underlying assumptions would likely cause a change in the results of the impairment assessments and, as such, could cause fair value to be less than the carrying amounts and result in an impairment of those assets. In the event such a result occurred, the Company would be required to record a corresponding charge, which would impact earnings. The Company would also be required to reduce the carrying amounts of the related assets on its balance sheet. For all reporting units, except for Brazil, there was significant headroom in the goodwill impairment analysis. Based on the results of the Company’s annual goodwill impairment test performed for all of its reporting units, except for Brazil, as of the September 28, 2019 balance sheet date, for reporting units that hold 97.2% of the Company’s goodwill, those units had an estimated fair value at least 60% higher than the respective reporting unit’s carrying amount. which holds 2.8% of the Company’s as of September 28, 2019 For all units of account, except for New Zealand, there was significant headroom in the franchise rights acquired impairment analysis. Based on the results of the Company’s annual franchise rights acquired impairment analysis performed for all of its units of account, except for New Zealand, as of the September 28, 2019 balance sheet date, for units of account that hold 99.4% of the Company’s franchise rights acquired, those units had an estimated fair value at least 40 underlying assumptions for New Zealand would likely cause a change in the results of the impairment assessment and, as such, could result in an impairment of the franchise rights acquired related to New Zealand, for which the net book value was $ 4,455 as of September 28, 2019 . The following is a discussion of the goodwill and franchise rights acquired impairment analysis. Goodwill In performing the impairment analysis for goodwill, the fair value for the Company’s reporting units is estimated using a discounted cash flow approach. This approach involves projecting future cash flows attributable to the reporting unit and discounting those estimated cash flows using an appropriate discount rate. The estimated fair value is then compared to the carrying value of the reporting unit. The Company has determined the appropriate reporting unit for purposes of assessing annual impairment to be the country for all reporting units. The values of goodwill in the United States, Canada, Brazil and other countries as of the September 28, 2019 balance sheet date were $98,857, $40,442, $4,278 and $9,229, respectively. For all of the Company’s reporting units except for Brazil (see below), the Company estimated future cash flows by utilizing the historical debt-free cash flows (cash flows provided by operating activities less capital expenditures) attributable to that country and then applied expected future operating income growth rates for such country. The Company utilized operating income as the basis for measuring its potential growth because it believes it is the best indicator of the performance of its business. The Company then discounted the estimated future cash flows utilizing a discount rate which was calculated using the average cost of capital, which included the cost of equity and the cost of debt. The cost of equity was determined by combining a risk-free rate of return and a market risk premium for the Company’s peer group. The risk-free rate of return was determined based on the average rate of long-term U.S. Treasury securities. The market risk premium was determined by reviewing external market data. The cost of debt was determined by estimating the Company’s current borrowing rate. As it relates to the goodwill impairment analysis for Brazil, the Company estimated future debt-free cash flows in contemplation of its growth strategies for that market. In developing these projections, the Company considered the historical impact of similar growth strategies in other markets as well as the current market conditions in Brazil. The Company then discounted the estimated future cash flows utilizing a discount rate which was calculated using the average cost of capital, which included the cost of equity and the cost of debt. The cost of equity was determined by combining a risk-free rate of return and a market risk premium for the Company’s peer group. The risk-free rate of return was determined based on the average rate of long-term U.S. Treasury securities. The market risk premium was determined by reviewing external market data including the current economic conditions in Brazil and the country specific risk thereon, all as reflected in the discount rate. The cost of debt was determined by estimating the Company’s current borrowing rate. Franchise Rights Acquired Finite-lived franchise rights acquired are amortized over the remaining contractual period, which is generally less than one year. Indefinite-lived franchise rights acquired are tested on an annual basis for impairment. In performing the impairment analysis for indefinite-lived franchise rights acquired, the fair value for franchise rights acquired is estimated using a discounted cash flow approach referred to as the hypothetical start-up approach for franchise rights related to the Company’s Studio + Digital business and a relief from royalty methodology for franchise rights related to the Company’s Digital business. The aggregate estimated fair value for these rights is then compared to the carrying value of the unit of account for those franchise rights. The Company has determined the appropriate unit of account for purposes of assessing impairment to be the combination of the rights in both the Studio + Digital business and the Digital business in the country in which the applicable acquisition occurred. The book values of these franchise rights in the United States, Canada, United Kingdom, Australia and New Zealand at September 28, 2019 were $671,914, $54,456, $11,072, $6,081 and $4,455, respectively. In its hypothetical start-up approach analysis for fiscal 2019, the Company assumed that the year of maturity was reached after 7 years. Subsequent to the year of maturity, the Company estimated future cash flows for the Studio + Digital business in each country based on assumptions regarding revenue growth and operating income margins. The cash flows associated with the Digital business in each country were based on the expected Digital revenue for such country and the application of a market-based royalty rate. The cash flows for the Studio + Digital and Digital businesses were discounted utilizing rates consistent with those utilized in the annual goodwill impairment analysis. Finite-lived Intangible Assets The carrying values of finite-lived intangible assets as of September 28, 2019 and December 29, 2018 were as follows: September 28, 2019 December 29, 2018 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Amount Amortization Capitalized software costs $ 131,559 $ 110,009 $ 121,508 $ 102,659 Website development costs 117,972 90,832 105,710 77,825 Trademarks 11,805 11,172 11,620 11,010 Other 13,982 4,488 13,967 4,149 Trademarks and other intangible assets $ 275,318 $ 216,501 $ 252,805 $ 195,643 Franchise rights acquired 8,030 4,415 8,110 4,319 Total finite-lived intangible assets $ 283,348 $ 220,916 $ 260,915 $ 199,962 Aggregate amortization expense for finite-lived intangible assets was recorded in the amounts of $6,973 and $22,014 for the three and nine months ended September 28, 2019, respectively. Aggregate amortization expense for finite-lived intangible assets was recorded in the amounts of $7,213 and $21,453 for the three and nine months ended September 29, 2018, respectively. Estimated amortization expense of existing finite-lived intangible assets for the next five fiscal years and thereafter is as follows: Remainder of fiscal 2019 $ 7,129 Fiscal 2020 $ 23,281 Fiscal 2021 $ 15,374 Fiscal 2022 $ 5,406 Fiscal 2023 and thereafter $ 11,242

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 28, 2019
Debt Disclosure [Abstract]
Long-Term Debt	8 . The components of the Company’s long-term debt were as follows: September 28, 2019 December 29, 2018 Principal Balance Unamortized Deferred Financing Costs Unamortized Debt Discount Effective Rate (1) Principal Balance Unamortized Deferred Financing Costs Unamortized Debt Discount Effective Rate (1) Revolving Credit Facility due November 29, 2022 $ 0 $ 0 $ 0 0.00 % $ 0 $ 0 $ 0 4.39 % Term Loan Facility due November 29, 2024 1,374,500 7,003 22,733 7.93 % 1,482,250 8,307 26,033 7.53 % Notes due December 1, 2025 300,000 1,072 0 8.62 % 300,000 1,202 0 8.69 % Total $ 1,674,500 $ 8,075 $ 22,733 8.06 % $ 1,782,250 $ 9,509 $ 26,033 7.63 % Less: Current Portion 77,000 77,000 Unamortized Deferred Financing Costs 8,075 9,509 Unamortized Debt Discount 22,733 26,033 Total Long-Term Debt $ 1,566,692 $ 1,669,708 (1) Includes amortization of deferred financing costs and debt discount. On November 29, 2017, the Company refinanced its then-existing credit facilities (hereinafter referred to as “the November 2017 debt refinancing”) consisting of $1,930,386 of borrowings under a term loan facility and an undrawn $50,000 revolving credit facility with $1,565,000 of borrowings under its new credit facilities, consisting of a $1,540,000 term loan facility, and a $150,000 revolving credit facility (of which $25,000 was drawn upon at the time of the November 2017 debt refinancing) (collectively, the “Credit Facilities”), and $300,000 in aggregate principal amount of 8.625% Senior Notes due 2025 (the “Notes”). During the fourth quarter of fiscal 2017, t thereto. This early extinguishment of debt write-off was comprised of $ 5,716 of deferred financing fees paid in connection with the November 2017 debt refinancing and $ 4,808 of pre-existing deferred financing fees. Senior Secured Credit Facilities The Credit Facilities were issued under a new credit agreement, dated November 29, 2017 (the “Credit Agreement”), among the Company, as borrower, the lenders party thereto, JPMorgan Chase Bank, N.A. (“JPMorgan Chase”), as administrative agent and an issuing bank, Bank of America, N.A., as an issuing bank, and Citibank, N.A., as an issuing bank. The Credit Facilities consist of (1) $1,540,000 in aggregate principal amount of senior secured tranche B term loans due in 2024 (the “Term Loan Facility”) and (2) a $150,000 senior secured revolving credit facility (which includes borrowing capacity available for letters of credit) due in 2022 (the “Revolving Credit Facility”). On May 31, 2019, the Company made a voluntary prepayment at par of $50,000 in respect of its outstanding term loans under the Term Loan Facility. As a result of this prepayment, the Company wrote off deferred financing fees of $267 in the second quarter of fiscal 2019. As of September 28, 2019, the Company had $ 1,374,500 All obligations under the Credit Agreement are guaranteed by, subject to certain exceptions, each of the Company’s current and future wholly-owned material domestic restricted subsidiaries. All obligations under the Credit Agreement, and the guarantees of those obligations, are secured by substantially all of the assets of the Company and each guarantor, subject to customary exceptions, including: • a pledge of 100% of the equity interests directly held by the Company and each guarantor in any wholly-owned domestic material subsidiary of the Company or any guarantor (which pledge, in the case of any non-U.S. subsidiary of a U.S. subsidiary, will not include more than 65% of the voting stock of such first-tier non-U.S. subsidiary), subject to certain exceptions; and • a security interest in substantially all other tangible and intangible assets of the Company and each guarantor, subject to certain exceptions. Under the terms of the Credit Agreement, depending on the Company’s Consolidated First Lien Net Debt Leverage Ratio (as used in the Credit Agreement), on an annual basis on or about the time the Company is required to deliver its financial statements for any fiscal year, the Company is obligated to offer to prepay a portion of the outstanding principal amount of the Term Loan Facility in an aggregate amount determined by a percentage of its annual excess cash flow (as defined in the Credit Agreement) (said payment, a “Cash Flow Sweep”). Borrowings under the Term Loan Facility bear interest at a rate per annum equal to, at the Company’s option, either (1) an applicable margin plus a base rate determined by reference to the highest of (a) 0.50% per annum plus the higher of (i) the Federal Funds Effective Rate and (ii) the Overnight Bank Funding Rate as determined by the Federal Reserve Bank of New York, (b) the prime rate of JPMorgan Chase and (c) the LIBOR rate determined by reference to the cost of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%; provided that such rate is not lower than a floor of 1.75% or (2) an applicable margin plus a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, provided that LIBOR is not lower than a floor of 0.75%. Borrowings under the Revolving Credit Facility bear interest at a rate per annum equal to an applicable margin based upon a leverage-based pricing grid, plus, at the Company’s option, either (1) a base rate determined by reference to the highest of (a) 0.50% per annum plus the higher of (i) the Federal Funds Effective Rate and (ii) the Overnight Bank Funding Rate as determined by the Federal Reserve Bank of New York, (b) the prime rate of JPMorgan Chase and (c) the LIBOR rate determined by reference to the cost of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00% or (2) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs. As of September 28, 2019, the applicable margins for the LIBOR rate borrowings under the Term Loan Facility and the Revolving Credit Facility were 4.75% and 2.25%, respectively. On a quarterly basis, the Company pays a commitment fee to the lenders under the Revolving Credit Facility in respect of unutilized commitments thereunder, which commitment fee fluctuates depending upon the Company’s Consolidated First Lien Net Debt Leverage Ratio. Based on the Company’s Consolidated First Lien Net Debt Leverage Ratio as of September 28, 2019, the commitment fee was % per annum. The Company’s Consolidated First Lien Net Debt Leverage Ratio as of September 28, 2019 was 2.92 :1.00. The Credit Agreement contains other customary terms, including (1) representations, warranties and affirmative covenants, (2) negative covenants, including limitations on indebtedness, liens, mergers, acquisitions, asset sales, investments, distributions, prepayments of subordinated debt, amendments of material agreements governing subordinated indebtedness, changes to lines of business and transactions with affiliates, in each case subject to baskets, thresholds and other exceptions, and (3) customary events of default. The availability of certain baskets and the ability to enter into certain transactions are also subject to compliance with certain financial ratios. In addition, the Revolving Credit Facility includes a maintenance covenant that will require, in certain circumstances, compliance with certain first lien secured net leverage ratios. As of September 28, 2019, the Company was in compliance with all applicable financial covenants in the Credit Agreement governing the Credit Facilities. Senior Notes The Notes were issued pursuant to an Indenture, dated as of November 29, 2017 (the “Indenture”), among the Company, the guarantors named therein and The Bank of New York Mellon, as trustee. The Indenture contains customary covenants, events of default and other provisions for an issuer of non-investment grade debt securities. These covenants include limitations on indebtedness, liens, mergers, acquisitions, asset sales, investments, distributions, prepayments of subordinated debt and transactions with affiliates, in each case subject to baskets, thresholds and other exceptions. The Notes accrue interest at a rate per annum equal to 8.625% and are due on December 1, 2025. Interest on the Notes is payable semi-annually on June 1 and December 1 of each year, beginning on June 1, 2018. On or after December 1, 2020, the Company may on any one or more occasions redeem some or all of the Notes at a purchase price equal to 104.313% of the principal amount of the Notes, plus accrued and unpaid interest, if any, to, but not including, the redemption date, such optional redemption price decreasing to 102.156% on or after December 1, 2021 and to 100.000% on or after December 1, 2022. Prior to December 1, 2020, the Company may on any one or more occasions redeem up to 40% of the aggregate principal amount of the Notes with an amount not to exceed the net proceeds of certain equity offerings at 108.625% of the aggregate principal amount thereof, plus accrued and unpaid interest, if any, to, but not including, the redemption date. Prior to December 1, 2020, the Company may redeem some or all of the Notes at a make-whole price plus accrued and unpaid interest, if any, to, but not including, the redemption date. If a change of control occurs, the Company must offer to purchase for cash the Notes at a purchase price equal to 101% of the principal amount of the Notes, plus accrued and unpaid interest, if any, to, but not including, the purchase date. Following the sale of certain assets and subject to certain conditions, the Company must offer to purchase for cash the Notes at a purchase price equal to 100% of the principal amount of the Notes, plus accrued and unpaid interest, if any, to, but not including, the purchase date. The Notes are guaranteed on a senior unsecured basis by the Company’s subsidiaries that guarantee the Credit Facilities. Outstanding Debt At September 28, 2019, the Company had $ 1,674,500 1,374,500 At September 28, 2019 and December 29, 2018, the Company’s debt consisted of both fixed and variable-rate instruments. Interest rate swaps were entered into to hedge a portion of the cash flow exposure associated with the Company’s variable-rate borrowings. See Note 13 for information on the Company’s interest rate swaps. The weighted average interest rate (which includes amortization of deferred financing costs and debt discount) on the Company’s outstanding debt, exclusive of the impact of the swap in effect, was approximately 8.06 %

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 28, 2019
Earnings Per Share [Abstract]
Earnings Per Share	9 . Basic earnings per share (“EPS”) are calculated utilizing the weighted average number of common shares outstanding during the periods presented. Diluted EPS is calculated utilizing the weighted average number of common shares outstanding during the periods presented adjusted for the effect of dilutive common stock equivalents. The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 Numerator: Net income attributable to WW International, Inc. $ 47,086 $ 70,132 $ 90,233 $ 179,964 Denominator: Weighted average shares of common stock outstanding 67,298 66,701 67,129 66,074 Effect of dilutive common stock equivalents 2,319 3,630 2,235 4,043 Weighted average diluted common shares outstanding 69,617 70,331 69,364 70,117 Earnings per share attributable to WW International, Inc. Basic $ 0.70 $ 1.05 $ 1.34 $ 2.72 Diluted $ 0.68 $ 1.00 $ 1.30 $ 2.57 The number of anti-dilutive common stock equivalents excluded from the calculation of the weighted average number of common shares for diluted EPS was 1,687 and 9 for the three months ended September 28, 2019 and September 29, 2018, respectively. The number of anti-dilutive common stock equivalents excluded from the calculation of the weighted average number of common shares for diluted EPS was 1,793 and 35 for the nine months ended September 28, 2019 and September 29, 2018, respectively.

Stock Plans

Stock Plans	9 Months Ended
	Sep. 28, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Plans	10 . On May 6, 2008 and May 12, 2004, respectively, the Company’s shareholders approved the 2008 Stock Incentive Plan (the “2008 Plan”) and the 2004 Stock Incentive Plan (the “2004 Plan”). On May 6, 2014, the Company’s shareholders approved the 2014 Stock Incentive Plan (as amended and restated, the “2014 Plan”, and together with the 2004 Plan and the 2008 Plan, the “Stock Plans”), which replaced the 2008 Plan and 2004 Plan for all equity-based awards granted on or after May 6, 2014. The 2014 Plan is designed to promote the long-term financial interests and growth of the Company by attracting, motivating and retaining employees with the ability to contribute to the success of the business and to align compensation for the Company’s employees over a multi-year period directly with the interests of the shareholders of the Company. The Company’s long-term equity incentive compensation program has historically included time-vesting non-qualified stock option and/or restricted stock unit (including performance-based stock unit with both time- and performance-vesting criteria (“PSUs”)) awards. The Company’s Board of Directors or a committee thereof administers the 2014 Plan. In fiscal 2019, the Company granted 280.1 PSUs having both time- and performance-vesting criteria. The time-vesting criteria for these PSUs will be satisfied upon continued employment (with limited exceptions) on the third anniversary of the grant date. The performance-vesting criteria for these PSUs will be satisfied if the Company has achieved a certain annual operating income objective for the performance period of fiscal 2021. Pursuant to these awards, the number of PSUs that become vested, if any, upon the satisfaction of both vesting criteria, shall be equal to (x) the target number of PSUs granted multiplied by (y) the applicable achievement percentage, rounded down to avoid the issuance of fractional shares. The Company is currently accruing compensation expense to what it believes is the probable outcome upon vesting. In fiscal 2018, the Company granted 81.3 PSUs having both time- and performance-vesting criteria. The time-vesting criteria for these PSUs will be satisfied upon continued employment (with limited exceptions) on the third anniversary of the grant date. The performance-vesting criteria for these PSUs will be satisfied if the Company has achieved a certain annual operating income objective for the performance period of fiscal 2020. Pursuant to these awards, the number of PSUs that become vested, if any, upon the satisfaction of both vesting criteria, shall be equal to (x) the target number of PSUs granted multiplied by (y) the applicable achievement percentage, rounded down to avoid the issuance of fractional shares. The applicable achievement percentage shall increase in the event the Company has achieved a certain revenue target during such performance period. The Company is currently accruing compensation expense to what it believes is the probable outcome upon vesting. In fiscal 2017, the Company granted 98.5 PSUs in May 2017 and 47.9 PSUs in July 2017, all having both time- and performance-vesting criteria. The time-vesting criteria for these PSUs will be satisfied upon continued employment (with limited exceptions) on May 15, 2020. The performance-vesting criteria for these PSUs will be satisfied if the Company has achieved, in the case of the May 2017 awards, certain annual operating income objectives and, in the case of the July 2017 award, certain net income or operating income objectives, as applicable, for each performance year, in each fiscal year over a three-year period (i.e., fiscal 2017 through fiscal 2019) (each, a “2017 Award Performance Year”). When the performance measure has been met for a particular 2017 Award Performance Year, that portion of units is “banked” for potential issuance following the satisfaction of the time-vesting criteria. Such portion of units to be “banked” shall be equal to (x) the target number of PSUs granted for the applicable 2017 Award Performance Year multiplied by (y) the applicable achievement percentage, rounded down to avoid the issuance of fractional shares. The Company is currently accruing compensation expense to what it believes is the probable outcome upon vesting. In fiscal 2016, the Company granted 289.9 PSUs having both time- and performance-vesting criteria. The time-vesting criteria for these PSUs was satisfied upon continued employment (with limited exceptions) on the third anniversary of the grant date (i.e., May 16, 2019). The performance-vesting criteria for these PSUs was satisfied when the Company achieved a Debt Ratio (as defined in the applicable term sheet for these PSU awards and based on a Debt to EBITDAS ratio (each, as defined therein)) at levels at or below 4.5x over the performance period from December 31, 2017 to December 29, 2018. Pursuant to these awards, the number of PSUs that became vested upon the satisfaction of the time-vesting criteria of 219.3 was calculated as (x) the target number of PSUs granted multiplied by (y) 166.67%, the applicable Debt Ratio achievement percentage, rounded down to avoid the issuance of fractional shares. The Company accrued compensation expense in an amount equal to the outcome upon vesting.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 28, 2019
Income Tax Disclosure [Abstract]
Income Taxes	1 1 . The effective tax rates for the three and nine months ended September 28, 2019 were 21.8% and 23.0%, respectively. The effective tax rates for the three and nine months ended September 29, 2018 were 15.0% and 9.8%, respectively. For the nine months ended September 28, 2019, the primary difference between the U.S. federal statutory tax rate and the Company’s consolidated effective tax rate was due to $3,242 of tax expense related to income earned in foreign jurisdictions, $2,998 of tax expense related to global intangible low-taxed income (“GILTI”) and oreign-derived intangible income (“FDII”), a the primary difference between the U.S. federal statutory tax rate and the Company’s consolidated effective tax rate was due to the $24,632 tax benefit related to tax windfalls from stock compensation, a $3,811 reversal of tax reserves resulting from the closure of various tax audits, a $3,697 tax benefit related to favorable tax return adjustments and a $1,859 tax benefit related to the cessation of operations of the Company’s Mexican subsidiary. The differences between the U.S. federal statutory tax rate and the Company’s consolidated effective tax rate were as follows: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 U.S. federal statutory tax rate 21.0 % 21.0 % 21.0 % 21.0 % State income taxes (net of federal benefit) 0.8 % (0.6 %) 1.9 % 1.1 % Cessation of operations 0.0 % 0.0 % (0.6 %) (0.9 %) Research and development credit (1.2 %) (0.3 %) (1.1 %) (0.3 %) Tax windfall on share-based awards (0.3 %) (3.0 %) (0.1 %) (12.4 %) Tax return adjustments related to the 2017 Tax Act (1.7 %) (3.3 %) (0.9 %) (1.3 %) Reserve for uncertain tax positions 0.0 % (4.6 %) (1.2 %) (1.8 %) GILTI 2.0 % 0.0 % 2.6 % 0.0 % FDII (4.9 %) 0.0 % (3.6 %) 0.0 % Impact of foreign operations 3.7 % 4.2 % 2.8 % 3.2 % Other 2.4 % 1.6 % 2.2 % 1.2 % Total effective tax rate 21.8 % 15.0 % 23.0 % 9.8 %

Legal

Legal	9 Months Ended
	Sep. 28, 2019
Commitments And Contingencies Disclosure [Abstract]
Legal	1 2 . Securities Class Action and Derivative Matters In March 2019, two substantially identical class action complaints alleging violations of the federal securities laws were filed by individual shareholders against the Company, certain of the Company’s current officers and the Company’s former controlling shareholder, Artal Group S.A. (“Artal”), in the United States District Court for the Southern District of New York. The actions were consolidated and lead plaintiffs were appointed in June 2019. A consolidated amended complaint was filed on July 29, 2019, naming as defendants the Company, certain of the Company’s current officers and directors, and Artal and certain of its affiliates. A second consolidated amended complaint was filed on September 27, 2019. The operative complaint asserts claims on behalf of all purchasers of the Company’s common stock between May 4, 2018 and February 26, 2019, inclusive (the “Class Period”), including purchasers of the Company’s common stock traceable to the May 2018 secondary offering of the Company’s common stock by certain of its shareholders. The complaint alleges that, during the Class Period, the defendants disseminated materially false and misleading statements and/or concealed or recklessly disregarded material adverse facts. The complaint alleges claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 thereunder, and with respect to the secondary offering, under Sections 11, 12(a)(2), and 15 of the Securities Act of 1933, as amended On March 26, 2019, June 4, 2019, July 22, 2019, and July 26, 2019, the Company received shareholder litigation demands alleging breaches of fiduciary duties by certain current and former Company directors and executive officers, to the alleged injury of the Company. On June 13, 2019, a separate shareholder derivative complaint was filed in the Southern District of New York against the Company’s Board of Directors alleging that the directors breached fiduciary duties to the alleged injury of the Company. The plaintiff voluntarily dismissed the complaint on July 8, 2019 and the Company agreed to treat the complaint as a litigation demand. On July 23, 2019, another separate shareholder derivative complaint was filed in the Southern District of New York against the Board of Directors alleging, among other things, that the directors breached fiduciary duties to the alleged injury of the Company. The plaintiff voluntarily dismissed the complaint the same day. On October 25, 2019, another separate shareholder derivative complaint was filed in the Southern District of New York against the Board of Directors alleging, among other things, that the directors breached fiduciary duties to the alleged injury of the Company. The allegations in the demands relate to those contained in the ongoing securities class action litigation. In response to the demands, pursuant to Virginia law, the Board of Directors has created a special committee to investigate and evaluate the claims made in the demands. Other Litigation Matters Due to the nature of the Company’s activities, it is also, at times, subject to other pending and threatened legal actions, including patent and other intellectual property actions, that arise out of the ordinary course of business. In the opinion of management, the disposition of any such matters is not expected, individually or in the aggregate, to have a material adverse effect on the Company’s results of operations, financial condition or cash flows. However, the results of legal actions cannot be predicted with certainty. Therefore, it is possible that the Company’s results of operations, financial condition or cash flows could be materially adversely affected in any particular period by the unfavorable resolution of one or more legal actions.

Derivative Instruments and Hedg

Derivative Instruments and Hedging	9 Months Ended
	Sep. 28, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging	1 3 . As of September 28, 2019 and December 29, 2018, the Company had in effect an interest rate swap with a notional amount totaling $1,000,000 and $1,250,000, respectively. On July 26, 2013, in order to hedge a portion of its variable rate debt, the Company entered into a forward-starting interest rate swap with an effective date of March 31, 2014 and a termination date of April 2, 2020. The initial notional amount of this swap was $1,500,000. During the term of this swap, the notional amount decreased from $1,500,000 effective March 31, 2014 to $1,250,000 on April 3, 2017 and $1,000,000 on April 1, 2019. This interest rate swap effectively fixes the variable interest rate on the notional amount of this swap at 2.41%. This swap qualifies for hedge accounting and, therefore, changes in the fair value of this swap have been recorded in accumulated other comprehensive loss. On June 11, 2018, in order to hedge a portion of its variable rate debt, the Company entered into a forward-starting interest rate swap (the “2018 swap”) with an effective date of April 2, 2020 and a termination date of March 31, 2024. The initial notional amount of this swap is $500,000. During the term of this swap, the notional amount will decrease from $500,000 effective April 2, 2020 to $250,000 on March 31, 2021. This interest rate swap effectively fixes the variable interest rate on the notional amount of this swap at 3.1005%. On June 7, 2019, in order to hedge a portion of its variable rate debt, the Company entered into a forward-starting interest rate swap (together with the 2018 swap, the “future swaps”) with an effective date of April 2, 2020 and a termination date of March 31, 2024. The notional amount of this swap is $250,000. This interest rate swap effectively fixes the variable interest rate on the notional amount of this swap at 1.901%. The future swaps qualify for hedge accounting and, therefore, changes in the fair value of the future swaps have been recorded in accumulated other comprehensive loss. As of September 28, 2019 and December 29, 2018, cumulative unrealized losses for qualifying hedges were reported as a component of accumulated other comprehensive loss in the amounts of $17,917 ($24,067 before taxes) and $1,175 ($1,634 before taxes), respectively. As of September 28, 2019, the fair value of the Company’s then-effective swap was a liability of $2,241, which is included in derivative payable in the consolidated balance sheet. As of September 28, 2019, the fair value of the Company’s future swaps was a liability of $22,039, which is included in derivative payable in the consolidated balance sheet. As of December 29, 2018, the fair value of the Company’s then-effective swap included a current asset of $3,526 and a noncurrent asset of $398, which are included in other current assets and other noncurrent assets, respectively, in the consolidated balance sheet. As of December 29, 2018, the fair value of the Company’s 2018 swap was a liability of $5,578, which is included in derivative payable in the consolidated balance sheet. The Company is hedging forecasted transactions for periods not exceeding the next five years. The Company expects approximately $4,824 ($6,467 before taxes) of derivative losses included in accumulated other comprehensive loss at September 28, 2019, based on current market rates, will be reclassified into earnings within the next 12 months.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 28, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	1 4 . Accounting guidance on fair value measurements for certain financial assets and liabilities requires that assets and liabilities carried at fair value be classified and disclosed in one of the following three categories: • Level 1 – Quoted prices in active markets for identical assets or liabilities. • Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. When measuring fair value, the Company is required to maximize the use of observable inputs and minimize the use of unobservable inputs. Fair Value of Financial Instruments The Company’s significant financial instruments include long-term debt and interest rate swap agreements as of September 28, 2019 and December 29, 2018. The fair value of the Company’s borrowings under the Revolving Credit Facility approximated a carrying value of $0 at September 28, 2019 and December 29, 2018, respectively. The fair value of the Company’s Credit Facilities is determined by utilizing average bid prices on or near the end of each fiscal quarter (Level 2 input). As of September 28, 2019 and December 29, 2018, the fair value of the Company’s long-term debt was approximately $1,658,608 and $1,757,717, respectively, as compared to the carrying value (net of deferred financing costs and debt discount) of $1,643,692 and $1,746,708, respectively. Derivative Financial Instruments The fair values for the Company’s derivative financial instruments are determined using observable current market information such as the prevailing LIBOR interest rate and LIBOR yield curve rates and include consideration of counterparty credit risk. See Note 13 for disclosures related to derivative financial instruments. The following table presents the aggregate fair value of the Company’s derivative financial instruments: Fair Value Measurements Using: Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Interest rate swap liability at September 28, 2019 $ 24,280 $ 0 $ 24,280 $ 0 Interest rate swap asset at December 29, 2018 $ 3,924 $ 0 $ 3,924 $ 0 Interest rate swap liability at December 29, 2018 $ 5,578 $ 0 $ 5,578 $ 0 The Company did not have any transfers into or out of Levels 1 and 2 and did not maintain any assets or liabilities classified as Level 3, during the nine months ended September 28, 2019 and the fiscal year ended December 29, 2018.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 28, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	1 5 . Amounts reclassified out of accumulated other comprehensive loss are as follows: Changes in Accumulated Other Comprehensive Loss by Component (a) Nine Months Ended September 28, 2019 Loss on Qualifying Hedges Loss on Foreign Currency Translation Total Beginning Balance at December 29, 2018 $ (1,175 ) $ (14,582 ) $ (15,757 ) Other comprehensive (loss) income before reclassifications, net of tax (15,585 ) 397 (15,188 ) Amounts reclassified from accumulated other comprehensive loss, net of tax (b) (1,157 ) 0 (1,157 ) Net current period other comprehensive (loss) income including noncontrolling interest (16,742 ) 397 (16,345 ) Less: net current period other comprehensive loss attributable to the noncontrolling interest 0 38 38 Ending Balance at September 28, 2019 $ (17,917 ) $ (14,147 ) $ (32,064 ) (a) Amounts in parentheses indicate debits (b) See separate table below for details about these reclassifications Nine Months Ended September 29, 2018 (Loss) Gain on Qualifying Hedges Loss on Foreign Currency Translation Total Beginning Balance at December 30, 2017 $ (5,392 ) $ (5,075 ) $ (10,467 ) Other comprehensive income (loss) before reclassifications, net of tax 9,248 (4,252 ) 4,996 Amounts reclassified from accumulated other comprehensive loss, net of tax (b) 2,098 0 2,098 Adoption of accounting standard (1,161 ) (1,324 ) (2,485 ) Net current period other comprehensive income (loss) including noncontrolling interest 10,185 (5,576 ) 4,609 Less: net current period other comprehensive loss attributable to the noncontrolling interest 0 406 406 Ending Balance at September 29, 2018 $ 4,793 $ (10,245 ) $ (5,452 ) (a) Amounts in parentheses indicate debits (b) See separate table below for details about these reclassifications Reclassifications out of Accumulated Other Comprehensive Loss (a) Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 Details about Other Comprehensive Loss Components Amounts Reclassified from Accumulated Other Comprehensive Loss Amounts Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Statement Where Net Income is Presented Loss on Qualifying Hedges Interest rate contracts $ (210 ) $ (210 ) $ 1,550 $ (2,813 ) Interest expense (210 ) (210 ) 1,550 (2,813 ) Income before income taxes 53 53 (393 ) 715 Provision for income taxes $ (157 ) $ (157 ) $ 1,157 $ (2,098 ) Net income (a) Amounts in parentheses indicate debits to profit/loss

Segment Data

Segment Data	9 Months Ended
	Sep. 28, 2019
Segment Reporting [Abstract]
Segment Data	1 6 . The Company has four reportable segments based on an integrated geographical structure as follows: North America, Continental Europe (CE), United Kingdom, and Other. Other consists of Australia, New Zealand and emerging markets operations and franchise revenues and related costs, all of which have been grouped together as if they were a single reportable segment because they do not meet any of the quantitative thresholds and are immaterial for separate disclosure. To be consistent with the information that is presented to the chief operating decision maker, the Company does not include intercompany activity in the segment results. Information about the Company’s reportable segments is as follows: Total Revenue, net Total Revenue, net Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 North America $ 243,684 $ 255,281 $ 749,341 $ 819,007 Continental Europe 71,138 72,394 224,623 236,518 United Kingdom 22,933 25,356 72,068 84,850 Other 10,812 12,734 34,722 43,360 Total revenue, net $ 348,567 $ 365,765 $ 1,080,754 $ 1,183,735 Net Income Net Income Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Segment operating income: North America $ 83,998 $ 99,513 $ 216,281 $ 273,905 Continental Europe 32,679 36,482 73,518 86,890 United Kingdom 3,271 5,743 6,829 15,646 Other 1,435 2,649 2,829 7,688 Total segment operating income 121,383 144,387 299,457 384,129 General corporate expenses 26,654 25,527 77,358 75,491 Interest expense 33,118 35,506 103,045 107,238 Other expense, net 1,460 881 2,201 1,978 Provision for income taxes 13,123 12,374 26,834 19,580 Net income $ 47,028 $ 70,099 $ 90,019 $ 179,842 Net loss attributable to the noncontrolling interest 58 33 214 122 Net income attributable to WW International, Inc. $ 47,086 $ 70,132 $ 90,233 $ 179,964 Depreciation and Amortization Depreciation and Amortization Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 North America $ 9,048 $ 9,102 $ 27,434 $ 27,744 Continental Europe 496 370 1,272 989 United Kingdom 164 383 588 1,098 Other 103 144 321 452 Total segment depreciation and amortization 9,811 9,999 29,615 30,283 General corporate depreciation and amortization 3,235 3,029 10,804 8,641 Depreciation and amortization $ 13,046 $ 13,028 $ 40,419 $ 38,924 Due to the adoption of the updated lease accounting guidance the Company has a right of use operating lease asset of $146,063 as of September 28, 2019, of which 52.7% is in the North America reportable segment

Related Party

Related Party	9 Months Ended
	Sep. 28, 2019
Related Party Transactions [Abstract]
Related Party	1 7 . As previously disclosed, on October 18, 2015, the Company entered into the Strategic Collaboration Agreement with Oprah Winfrey, under which she will consult with the Company and participate in developing, planning, executing and enhancing the WW program and related initiatives, and provide it with services in her discretion to promote the Company and its programs, products and services. In addition to the Strategic Collaboration Agreement, Ms. Winfrey and her related entities provided services to the Company totaling $662 and $2,665 for the three and nine months ended September 28, 2019, respectively, and $157 and $2,145 for the three and nine months ended September 29, 2018, respectively, which services included advertising, production and related fees. Also, during the three months ended September 28, 2019, the Company received advertising services from entities related to Ms. Winfrey at no charge with an estimated value of $330. The Company’s accounts payable to parties related to Ms. Winfrey at September 28, 2019 and December 29, 2018 was $246 and $62, respectively. In March 2018, as permitted by the transfer provisions set forth in the previously disclosed Share Purchase Agreement, dated October 18, 2015, between the Company and Ms. Winfrey, and the Option Agreement, dated October 18, 2015, between the Company and Ms. Winfrey, Ms. Winfrey sold 954 of the shares she purchased under such purchase agreement and exercised a portion of her stock options resulting in the sale of 1,405 shares issuable under such options, respectively.

Restructuring

Restructuring	9 Months Ended
	Sep. 28, 2019
Restructuring And Related Activities [Abstract]
Restructuring	1 8 . Restructuring As previously disclosed, in the first quarter of fiscal 2019, the Company undertook an organizational realignment which resulted in the elimination of certain positions and termination of employment for certain employees The Company recorded expenses in connection with employee termination benefit costs of $6,331 ($4,727 after tax) for the nine months ended September 28, 2019 (all expenses were recorded in the first quarter of fiscal 2019). These expenses impacted cost of revenues by $1,425 and selling, general and administrative expense by $4,906 in the nine months ended September 28, 2019. The Company does not anticipate recording additional expenses in connection with this organizational realignment. All expenses were recorded to general corporate expenses and therefore there was no impact to the segments. For the nine months ended September 28, 2019, the Company made payments of $4,504 towards the liability for these expenses and lowered provision estimates by $121. The Company expects the remaining liability of $1,706 to be paid in full in fiscal 2020.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 28, 2019
Leases [Abstract]
Schedule of Lease Assets and Lease Liabilities	At September 28, 2019, the Company’s lease assets and lease liabilities were as follows: September 28, 2019 Assets: Operating lease assets $ 146,063 Finance lease assets 384 Total leased assets $ 146,447 Liabilities: Current Operating $ 32,372 Finance 200 Noncurrent Operating $ 123,541 Finance 126 Total lease liabilities $ 156,239
Schedule of Components of Lease Expense	For the three and nine months ended September 28, 2019, the components of the Company’s lease expense were as follows Three Months Ended Nine Months Ended September 28, September 28, 2019 2019 Operating lease cost $ 12,906 $ 38,641 Finance lease cost: Amortization of leased assets 132 350 Interest on lease liabilities 4 17 Total finance lease cost $ 136 $ 367 Total lease cost $ 13,042 $ 39,008
Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rates	At September 28, 2019, the Company’s weighted average remaining lease term and weighted average discount rates were as follows: September 28, 2019 Weighted Average Remaining Lease Term (years) Operating leases 7.19 Finance leases 2.10 Weighted Average Discount Rate Operating leases 7.01 Finance leases 5.22
Schedule of Maturity of Lease Liabilities	At September 28, 2019, the maturity of the Company’s lease liabilities in each of the next five fiscal years and thereafter were as follows: Operating Leases Finance Leases Total Remainder of fiscal 2019 $ 8,614 $ 103 $ 8,717 2020 43,801 133 43,934 2021 35,194 50 35,244 2022 24,228 22 24,250 2023 16,858 24 16,882 Thereafter 75,700 5 75,705 Total lease payments $ 204,395 $ 337 $ 204,732 Less imputed interest 48,482 11 48,493 Present value of lease liabilities $ 155,913 $ 326 $ 156,239
Minimum Commitments Under Non-Cancelable Obligations	Minimum commitments under non-cancelable obligations, primarily for office and rental facilities operating leases, at December 29, 2018, consisted of the following: 2019 $ 63,261 2020 38,491 2021 22,341 2022 14,017 2023 9,192 2024 and thereafter 37,704 Total $ 185,006
Summary of Supplemental Cash Flow Information Related To Leases	Supplemental cash flow information related to leases for the nine months ended September 28, 2019 were as follows: Nine Months Ended September 28, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 38,664 Operating cash flows from finance leases $ 17 Financing cash flows from finance leases $ 350 Leased assets obtained in exchange for new operating lease liabilities $ 26,270 Leased assets obtained in exchange for new finance lease liabilities $ 105

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 28, 2019
Revenue From Contract With Customer [Abstract]
Schedule of Revenues Disaggregated by Revenue Source	The following table presents the Company’s revenues disaggregated by revenue source: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 Digital Subscription Revenues $ 153,940 $ 143,299 $ 459,764 $ 432,863 Studio + Digital Fees 144,101 168,664 458,771 551,499 Service Revenues, net $ 298,041 $ 311,963 $ 918,535 $ 984,362 Product sales and other, net 50,526 53,802 162,219 199,373 Revenues, net $ 348,567 $ 365,765 $ 1,080,754 $ 1,183,735
Schedule of Revenues Disaggregated by Segment	The following tables present the Company’s revenues disaggregated by revenue source and segment: Three Months Ended September 28, 2019 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 101,579 $ 42,230 $ 6,608 $ 3,523 $ 153,940 Studio + Digital Fees 108,338 20,644 10,733 4,386 144,101 Service Revenues, net $ 209,917 $ 62,874 $ 17,341 $ 7,909 $ 298,041 Product sales and other, net 33,767 8,264 5,592 2,903 50,526 Revenues, net $ 243,684 $ 71,138 $ 22,933 $ 10,812 $ 348,567 Three Months Ended September 29, 2018 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 95,664 $ 37,928 $ 6,282 $ 3,425 $ 143,299 Studio + Digital Fees 125,282 25,441 12,619 5,322 168,664 Service Revenues, net $ 220,946 $ 63,369 $ 18,901 $ 8,747 $ 311,963 Product sales and other, net 34,335 9,025 6,455 3,987 53,802 Revenues, net $ 255,281 $ 72,394 $ 25,356 $ 12,734 $ 365,765 Nine Months Ended September 28, 2019 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 303,190 $ 125,999 $ 20,019 $ 10,556 $ 459,764 Studio + Digital Fees 342,896 68,274 33,493 14,108 458,771 Service Revenues, net $ 646,086 $ 194,273 $ 53,512 $ 24,664 $ 918,535 Product sales and other, net 103,255 30,350 18,556 10,058 162,219 Revenues, net $ 749,341 $ 224,623 $ 72,068 $ 34,722 $ 1,080,754 Nine Months Ended September 29, 2018 North Continental United America Europe Kingdom Other Total Digital Subscription Revenues $ 289,002 $ 113,431 $ 19,800 $ 10,630 $ 432,863 Studio + Digital Fees 408,200 83,923 41,552 17,824 551,499 Service Revenues, net $ 697,202 $ 197,354 $ 61,352 $ 28,454 $ 984,362 Product sales and other, net 121,805 39,164 23,498 14,906 199,373 Revenues, net $ 819,007 $ 236,518 $ 84,850 $ 43,360 $ 1,183,735
Schedule of Accounts Receivable and Deferred Revenues	The opening and ending balances of the Company’s deferred revenues are as follows: Deferred Deferred Revenue Revenue-Long Term Balance as of December 29, 2018 $ 53,501 $ 961 Net increase (decrease) during the period 5,568 (717 ) Balance as of September 28, 2019 $ 59,069 $ 244

Franchise Rights Acquired, Go_2

Franchise Rights Acquired, Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 28, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Change in Carrying Amount of Goodwill	For the nine months ended September 28, 2019, the change in the carrying amount of goodwill was due to the effect of exchange rate changes as follows: North Continental United America Europe Kingdom Other Total Balance as of December 29, 2018 $ 138,156 $ 7,242 $ 1,178 $ 5,943 $ 152,519 Effect of exchange rate changes 1,142 (459 ) (38 ) (358 ) 287 Balance as of September 28, 2019 $ 139,298 $ 6,783 $ 1,140 $ 5,585 $ 152,806
Schedule of Carrying Values of Finite-lived Intangible Assets	The carrying values of finite-lived intangible assets as of September 28, 2019 and December 29, 2018 were as follows: September 28, 2019 December 29, 2018 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Amount Amortization Capitalized software costs $ 131,559 $ 110,009 $ 121,508 $ 102,659 Website development costs 117,972 90,832 105,710 77,825 Trademarks 11,805 11,172 11,620 11,010 Other 13,982 4,488 13,967 4,149 Trademarks and other intangible assets $ 275,318 $ 216,501 $ 252,805 $ 195,643 Franchise rights acquired 8,030 4,415 8,110 4,319 Total finite-lived intangible assets $ 283,348 $ 220,916 $ 260,915 $ 199,962
Schedule of Estimated Amortization Expense of Finite-lived Intangible Assets	Estimated amortization expense of existing finite-lived intangible assets for the next five fiscal years and thereafter is as follows: Remainder of fiscal 2019 $ 7,129 Fiscal 2020 $ 23,281 Fiscal 2021 $ 15,374 Fiscal 2022 $ 5,406 Fiscal 2023 and thereafter $ 11,242

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 28, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The components of the Company’s long-term debt were as follows: September 28, 2019 December 29, 2018 Principal Balance Unamortized Deferred Financing Costs Unamortized Debt Discount Effective Rate (1) Principal Balance Unamortized Deferred Financing Costs Unamortized Debt Discount Effective Rate (1) Revolving Credit Facility due November 29, 2022 $ 0 $ 0 $ 0 0.00 % $ 0 $ 0 $ 0 4.39 % Term Loan Facility due November 29, 2024 1,374,500 7,003 22,733 7.93 % 1,482,250 8,307 26,033 7.53 % Notes due December 1, 2025 300,000 1,072 0 8.62 % 300,000 1,202 0 8.69 % Total $ 1,674,500 $ 8,075 $ 22,733 8.06 % $ 1,782,250 $ 9,509 $ 26,033 7.63 % Less: Current Portion 77,000 77,000 Unamortized Deferred Financing Costs 8,075 9,509 Unamortized Debt Discount 22,733 26,033 Total Long-Term Debt $ 1,566,692 $ 1,669,708 (1) Includes amortization of deferred financing costs and debt discount.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 28, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 Numerator: Net income attributable to WW International, Inc. $ 47,086 $ 70,132 $ 90,233 $ 179,964 Denominator: Weighted average shares of common stock outstanding 67,298 66,701 67,129 66,074 Effect of dilutive common stock equivalents 2,319 3,630 2,235 4,043 Weighted average diluted common shares outstanding 69,617 70,331 69,364 70,117 Earnings per share attributable to WW International, Inc. Basic $ 0.70 $ 1.05 $ 1.34 $ 2.72 Diluted $ 0.68 $ 1.00 $ 1.30 $ 2.57

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 28, 2019
Income Tax Disclosure [Abstract]
Summary of Differences Between U.S. Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate	The differences between the U.S. federal statutory tax rate and the Company’s consolidated effective tax rate were as follows: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 U.S. federal statutory tax rate 21.0 % 21.0 % 21.0 % 21.0 % State income taxes (net of federal benefit) 0.8 % (0.6 %) 1.9 % 1.1 % Cessation of operations 0.0 % 0.0 % (0.6 %) (0.9 %) Research and development credit (1.2 %) (0.3 %) (1.1 %) (0.3 %) Tax windfall on share-based awards (0.3 %) (3.0 %) (0.1 %) (12.4 %) Tax return adjustments related to the 2017 Tax Act (1.7 %) (3.3 %) (0.9 %) (1.3 %) Reserve for uncertain tax positions 0.0 % (4.6 %) (1.2 %) (1.8 %) GILTI 2.0 % 0.0 % 2.6 % 0.0 % FDII (4.9 %) 0.0 % (3.6 %) 0.0 % Impact of foreign operations 3.7 % 4.2 % 2.8 % 3.2 % Other 2.4 % 1.6 % 2.2 % 1.2 % Total effective tax rate 21.8 % 15.0 % 23.0 % 9.8 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 28, 2019
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following table presents the aggregate fair value of the Company’s derivative financial instruments: Fair Value Measurements Using: Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Interest rate swap liability at September 28, 2019 $ 24,280 $ 0 $ 24,280 $ 0 Interest rate swap asset at December 29, 2018 $ 3,924 $ 0 $ 3,924 $ 0 Interest rate swap liability at December 29, 2018 $ 5,578 $ 0 $ 5,578 $ 0 The Company did not have any transfers into or out of Levels 1 and 2 and did not maintain any assets or liabilities classified as Level 3, during the nine months ended September 28, 2019 and the fiscal year ended December 29, 2018.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 28, 2019
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss by Component	Amounts reclassified out of accumulated other comprehensive loss are as follows: Changes in Accumulated Other Comprehensive Loss by Component (a) Nine Months Ended September 28, 2019 Loss on Qualifying Hedges Loss on Foreign Currency Translation Total Beginning Balance at December 29, 2018 $ (1,175 ) $ (14,582 ) $ (15,757 ) Other comprehensive (loss) income before reclassifications, net of tax (15,585 ) 397 (15,188 ) Amounts reclassified from accumulated other comprehensive loss, net of tax (b) (1,157 ) 0 (1,157 ) Net current period other comprehensive (loss) income including noncontrolling interest (16,742 ) 397 (16,345 ) Less: net current period other comprehensive loss attributable to the noncontrolling interest 0 38 38 Ending Balance at September 28, 2019 $ (17,917 ) $ (14,147 ) $ (32,064 ) (a) Amounts in parentheses indicate debits (b) See separate table below for details about these reclassifications Nine Months Ended September 29, 2018 (Loss) Gain on Qualifying Hedges Loss on Foreign Currency Translation Total Beginning Balance at December 30, 2017 $ (5,392 ) $ (5,075 ) $ (10,467 ) Other comprehensive income (loss) before reclassifications, net of tax 9,248 (4,252 ) 4,996 Amounts reclassified from accumulated other comprehensive loss, net of tax (b) 2,098 0 2,098 Adoption of accounting standard (1,161 ) (1,324 ) (2,485 ) Net current period other comprehensive income (loss) including noncontrolling interest 10,185 (5,576 ) 4,609 Less: net current period other comprehensive loss attributable to the noncontrolling interest 0 406 406 Ending Balance at September 29, 2018 $ 4,793 $ (10,245 ) $ (5,452 ) (a) Amounts in parentheses indicate debits (b) See separate table below for details about these reclassifications
Reclassifications out of Accumulated Other Comprehensive Loss	Reclassifications out of Accumulated Other Comprehensive Loss (a) Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, 2019 2018 2019 2018 Details about Other Comprehensive Loss Components Amounts Reclassified from Accumulated Other Comprehensive Loss Amounts Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Statement Where Net Income is Presented Loss on Qualifying Hedges Interest rate contracts $ (210 ) $ (210 ) $ 1,550 $ (2,813 ) Interest expense (210 ) (210 ) 1,550 (2,813 ) Income before income taxes 53 53 (393 ) 715 Provision for income taxes $ (157 ) $ (157 ) $ 1,157 $ (2,098 ) Net income (a) Amounts in parentheses indicate debits to profit/loss

Segment Data (Tables)

Segment Data (Tables)	9 Months Ended
	Sep. 28, 2019
Segment Reporting [Abstract]
Information About Reportable Segments	Information about the Company’s reportable segments is as follows: Total Revenue, net Total Revenue, net Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 North America $ 243,684 $ 255,281 $ 749,341 $ 819,007 Continental Europe 71,138 72,394 224,623 236,518 United Kingdom 22,933 25,356 72,068 84,850 Other 10,812 12,734 34,722 43,360 Total revenue, net $ 348,567 $ 365,765 $ 1,080,754 $ 1,183,735 Net Income Net Income Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Segment operating income: North America $ 83,998 $ 99,513 $ 216,281 $ 273,905 Continental Europe 32,679 36,482 73,518 86,890 United Kingdom 3,271 5,743 6,829 15,646 Other 1,435 2,649 2,829 7,688 Total segment operating income 121,383 144,387 299,457 384,129 General corporate expenses 26,654 25,527 77,358 75,491 Interest expense 33,118 35,506 103,045 107,238 Other expense, net 1,460 881 2,201 1,978 Provision for income taxes 13,123 12,374 26,834 19,580 Net income $ 47,028 $ 70,099 $ 90,019 $ 179,842 Net loss attributable to the noncontrolling interest 58 33 214 122 Net income attributable to WW International, Inc. $ 47,086 $ 70,132 $ 90,233 $ 179,964 Depreciation and Amortization Depreciation and Amortization Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 North America $ 9,048 $ 9,102 $ 27,434 $ 27,744 Continental Europe 496 370 1,272 989 United Kingdom 164 383 588 1,098 Other 103 144 321 452 Total segment depreciation and amortization 9,811 9,999 29,615 30,283 General corporate depreciation and amortization 3,235 3,029 10,804 8,641 Depreciation and amortization $ 13,046 $ 13,028 $ 40,419 $ 38,924

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 30, 2018	Dec. 29, 2018
Lessee Lease Description [Line Items]
Operating lease assets			$ 146,063			$ 0
Operating lease liabilities			$ 155,913
Lease weighted average remaining lease term			7 years 2 months 4 days
Operating leases, rent expense		$ 10,837		$ 32,369
Minimum
Lessee Lease Description [Line Items]
Leases, remaining lease term			0 years
Maximum
Lessee Lease Description [Line Items]
Leases, remaining lease term			13 years
ASU 2016-02
Lessee Lease Description [Line Items]
Operating lease assets					$ 155,178
Operating lease liabilities					163,486
Retained earnings for operating leases					$ 0
Prepaid Rent | ASU 2016-02
Lessee Lease Description [Line Items]
Revised prepaid rent	$ 3,595

Leases - Schedule of Lease Asse

Leases - Schedule of Lease Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Assets:
Operating lease assets	$ 146,063	$ 0
Finance lease assets	384
Total leased assets	146,447
Current
Operating	32,372	0
Finance	200
Noncurrent
Operating	123,541	$ 0
Finance	126
Total lease liabilities	$ 156,239

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019
Leases [Abstract]
Operating lease cost	$ 12,906	$ 38,641
Finance lease cost:
Amortization of leased assets	132	350
Interest on lease liabilities	4	17
Total finance lease cost	136	367
Total lease cost	$ 13,042	$ 39,008

Leases - Summary of Weighted Av

Leases - Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rates (Detail)	Sep. 28, 2019
Weighted Average Remaining Lease Term (years)
Operating leases	7 years 2 months 8 days
Finance leases	2 years 1 month 6 days
Weighted Average Discount Rate
Operating leases	7.01%
Finance leases	5.22%

Leases - Schedule of Maturity o

Leases - Schedule of Maturity of Lease Liabilities (Detail) $ in Thousands	Sep. 28, 2019USD ($)
Operating Leases
Remainder of fiscal 2019	$ 8,614
2020	43,801
2021	35,194
2022	24,228
2023	16,858
Thereafter	75,700
Total lease payments	204,395
Less imputed interest	48,482
Present value of lease liabilities	155,913
Finance Leases
Remainder of fiscal 2019	103
2020	133
2021	50
2022	22
2023	24
Thereafter	5
Total lease payments	337
Less imputed interest	11
Present value of lease liabilities	326
Total
Remainder of fiscal 2019	8,717
2020	43,934
2021	35,244
2022	24,250
2023	16,882
Thereafter	75,705
Total lease payments	204,732
Less imputed interest	48,493
Present value of lease liabilities	$ 156,239

Leases - Minimum Commitments Un

Leases - Minimum Commitments Under Non-Cancelable Obligations (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Lessee Lease Description [Line Items]
2020	$ 43,801
2021	35,194
2022	24,228
2023	16,858
2024 and thereafter	75,700
Total lease payments	$ 204,395
Non Cancelable Obligations
Lessee Lease Description [Line Items]
2019		$ 63,261
2020		38,491
2021		22,341
2022		14,017
2023		9,192
2024 and thereafter		37,704
Total lease payments		$ 185,006

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information Related To Leases (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 38,664
Operating cash flows from finance leases	17
Financing cash flows from finance leases	350
Leased assets obtained in exchange for new operating lease liabilities	26,270
Leased assets obtained in exchange for new finance lease liabilities	$ 105

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Dec. 29, 2018	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to deferred revenue	$ (59,069)	$ (53,501)
Decrease to prepaid expenses and other current assets	(25,397)	(42,355)
Increase to deferred income tax liability	178,153	$ 190,258
Deferred revenue recognized	$ 53,137
Revenue, practical expedient, remaining performance obligation, description	contracts with an original expected length of one year or less.
Revenue, remaining performance obligation, optional exemption, performance obligation	true
Other Liabilities
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Long-term deferred revenue	$ 244
Accounting Standards Update 2014-09 | Retained Earnings
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to opening retained earnings			$ 2,145
Difference between Revenue Guidance in Effect Before and After Topic 606 | Accounting Standards Update 2014-09
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to deferred revenue			3,501
Decrease to prepaid expenses and other current assets			568
Increase to deferred income tax liability			$ 788

Revenue - Schedule of Revenues

Revenue - Schedule of Revenues Disaggregated by Revenue Source (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 348,567	$ 365,765	$ 1,080,754	$ 1,183,735
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	153,940	143,299	459,764	432,863
Studio + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net	144,101	168,664	458,771	551,499
Service Revenues, net
Disaggregation Of Revenue [Line Items]
Revenues, net	298,041	311,963	918,535	984,362
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 50,526	$ 53,802	$ 162,219	$ 199,373

Revenue - Schedule of Revenue_2

Revenue - Schedule of Revenues Disaggregated by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 348,567	$ 365,765	$ 1,080,754	$ 1,183,735
North America
Disaggregation Of Revenue [Line Items]
Revenues, net	243,684	255,281	749,341	819,007
Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	71,138	72,394	224,623	236,518
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	22,933	25,356	72,068	84,850
Other
Disaggregation Of Revenue [Line Items]
Revenues, net	10,812	12,734	34,722	43,360
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	153,940	143,299	459,764	432,863
Digital Subscription Revenues | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	101,579	95,664	303,190	289,002
Digital Subscription Revenues | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	42,230	37,928	125,999	113,431
Digital Subscription Revenues | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	6,608	6,282	20,019	19,800
Digital Subscription Revenues | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	3,523	3,425	10,556	10,630
Studio + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net	144,101	168,664	458,771	551,499
Studio + Digital Fees | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	108,338	125,282	342,896	408,200
Studio + Digital Fees | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	20,644	25,441	68,274	83,923
Studio + Digital Fees | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	10,733	12,619	33,493	41,552
Studio + Digital Fees | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	4,386	5,322	14,108	17,824
Service Revenues, net
Disaggregation Of Revenue [Line Items]
Revenues, net	298,041	311,963	918,535	984,362
Service Revenues, net | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	209,917	220,946	646,086	697,202
Service Revenues, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	62,874	63,369	194,273	197,354
Service Revenues, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	17,341	18,901	53,512	61,352
Service Revenues, net | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	7,909	8,747	24,664	28,454
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net	50,526	53,802	162,219	199,373
Product sales and other, net | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	33,767	34,335	103,255	121,805
Product sales and other, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	8,264	9,025	30,350	39,164
Product sales and other, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	5,592	6,455	18,556	23,498
Product sales and other, net | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 2,903	$ 3,987	$ 10,058	$ 14,906

Revenue - Schedule of Accounts

Revenue - Schedule of Accounts Receivable and Deferred Revenues (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Deferred Revenue - Short Term
Contract With Customer Asset And Liability [Line Items]
Deferred Revenue, Beginning balance	$ 53,501
Net increase (decrease) during the period	5,568
Deferred Revenue, Ending balance	59,069
Deferred Revenue - Long Term
Contract With Customer Asset And Liability [Line Items]
Deferred Revenue, Beginning balance	961
Net increase (decrease) during the period	(717)
Deferred Revenue, Ending balance	$ 244

Acquisition of Kurbo Health, _2

Acquisition of Kurbo Health, Inc. - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 10, 2018	Sep. 28, 2019	Dec. 29, 2018
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill		$ 152,806	$ 152,519
Kurbo Health, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, net purchase price	$ 3,063
Business acquisition, purchase price allocation, goodwill	1,101	$ 152,806	$ 152,519
Business acquisition, purchase price allocation, prepaid expenses	78
Business acquisition, purchase price allocation, other assets	32
Business acquisition, purchase price allocation, deferred revenue	57
Business acquisition, purchase price allocation, other liabilities	7
Kurbo Health, Inc. | Website Development
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets	$ 1,916

Franchise Rights Acquired, Go_3

Franchise Rights Acquired, Goodwill and Other Intangible Assets - Change in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Goodwill [Line Items]
Beginning balance	$ 152,519
Ending balance	152,806
Kurbo Health, Inc.
Goodwill [Line Items]
Beginning balance	152,519
Effect of exchange rate changes	287
Ending balance	152,806
Kurbo Health, Inc. | North America
Goodwill [Line Items]
Beginning balance	138,156
Effect of exchange rate changes	1,142
Ending balance	139,298
Kurbo Health, Inc. | Continental Europe
Goodwill [Line Items]
Beginning balance	7,242
Effect of exchange rate changes	(459)
Ending balance	6,783
Kurbo Health, Inc. | United Kingdom
Goodwill [Line Items]
Beginning balance	1,178
Effect of exchange rate changes	(38)
Ending balance	1,140
Kurbo Health, Inc. | Other
Goodwill [Line Items]
Beginning balance	5,943
Effect of exchange rate changes	(358)
Ending balance	$ 5,585

Franchise Rights Acquired, Go_4

Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	May 05, 2019	May 06, 2018	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill			$ 152,806,000		$ 152,806,000			$ 152,519,000
Finite-lived intangible assets, aggregate amortization expense			$ 6,973,000	$ 7,213,000	$ 22,014,000	$ 21,453,000
Scenario, Forecast
Goodwill And Intangible Assets Disclosure [Line Items]
Franchise right maturity period							7 years
Brazil
Goodwill And Intangible Assets Disclosure [Line Items]
Reporting unit, percentage of estimated fair value in excess of carrying amount			3.00%		3.00%
Goodwill			$ 4,278,000		$ 4,278,000
NEW ZEALAND
Goodwill And Intangible Assets Disclosure [Line Items]
Reporting units percentage of rights acquired			0.60%		0.60%
Netbook value					$ 4,455,000
United States
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill			$ 98,857,000		98,857,000
Netbook value					671,914,000
Canada
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill			40,442,000		40,442,000
Netbook value					54,456,000
Other Countries
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill			$ 9,229,000		9,229,000
United Kingdom
Goodwill And Intangible Assets Disclosure [Line Items]
Netbook value					11,072,000
Australia
Goodwill And Intangible Assets Disclosure [Line Items]
Netbook value					$ 6,081,000
Goodwill
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of goodwill hold by reporting units			97.20%		97.20%
Minimum | Goodwill
Goodwill And Intangible Assets Disclosure [Line Items]
Reporting unit, percentage of estimated fair value in excess of carrying amount			2.80%		2.80%
Maximum
Goodwill And Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life (in years)					1 year
Franchise Rights
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges	$ 0	$ 0
Reporting units percentage of rights acquired			99.40%		99.40%
Franchise Rights | NEW ZEALAND
Goodwill And Intangible Assets Disclosure [Line Items]
Reporting unit, percentage of estimated fair value in excess of carrying amount			3.00%		3.00%
Netbook value					$ 4,455,000
Franchise Rights | Minimum
Goodwill And Intangible Assets Disclosure [Line Items]
Reporting unit, percentage of estimated fair value in excess of carrying amount			40.00%		40.00%

Franchise Rights Acquired, Go_5

Franchise Rights Acquired, Goodwill and Other Intangible Assets - Schedule of Carrying Values of Finite-lived Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 283,348	$ 260,915
Accumulated Amortization	220,916	199,962
Capitalized software costs
Finite-Lived Intangible Assets
Gross Carrying Amount	131,559	121,508
Accumulated Amortization	110,009	102,659
Website development costs
Finite-Lived Intangible Assets
Gross Carrying Amount	117,972	105,710
Accumulated Amortization	90,832	77,825
Trademarks
Finite-Lived Intangible Assets
Gross Carrying Amount	11,805	11,620
Accumulated Amortization	11,172	11,010
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	13,982	13,967
Accumulated Amortization	4,488	4,149
Trademarks and other intangible assets
Finite-Lived Intangible Assets
Gross Carrying Amount	275,318	252,805
Accumulated Amortization	216,501	195,643
Franchise Rights
Finite-Lived Intangible Assets
Gross Carrying Amount	8,030	8,110
Accumulated Amortization	$ 4,415	$ 4,319

Franchise Rights Acquired, Go_6

Franchise Rights Acquired, Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense of Finite-lived Intangible Assets (Detail) $ in Thousands	Sep. 28, 2019USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of fiscal 2019	$ 7,129
Fiscal 2020	23,281
Fiscal 2021	15,374
Fiscal 2022	5,406
Fiscal 2023 and thereafter	$ 11,242

Components of Current and Long-

Components of Current and Long-Term Debt (Detail) - USD ($)		Sep. 28, 2019	Dec. 29, 2018
Debt Instrument
Total Debt		$ 1,674,500,000	$ 1,782,250,000
Less: Current Portion		77,000,000	77,000,000
Unamortized Deferred Financing Costs		8,075,000	9,509,000
Unamortized Debt Discount		22,733,000	26,033,000
Total Long-Term Debt		$ 1,566,692,000	$ 1,669,708,000
Effective Interest Rate	[1]	8.06%	7.63%
Term Loan due November 29, 2024
Debt Instrument
Total Debt		$ 1,374,500,000	$ 1,482,250,000
Unamortized Deferred Financing Costs		7,003,000	8,307,000
Unamortized Debt Discount		$ 22,733,000	$ 26,033,000
Effective Interest Rate	[1]	7.93%	7.53%
Notes due December 1, 2025
Debt Instrument
Total Debt		$ 300,000,000	$ 300,000,000
Unamortized Deferred Financing Costs		1,072,000	1,202,000
Unamortized Debt Discount		$ 0	$ 0
Effective Interest Rate	[1]	8.62%	8.69%
Revolving Credit Facility due November 29, 2022
Debt Instrument
Total Debt		$ 0	$ 0
Unamortized Deferred Financing Costs		0	0
Unamortized Debt Discount		$ 0	$ 0
Effective Interest Rate	[1]	0.00%	4.39%
[1]	Includes amortization of deferred financing costs and debt discount.

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)		Nov. 30, 2020	May 31, 2019	Nov. 29, 2017	Jun. 29, 2019	Dec. 30, 2017	Sep. 28, 2019	Dec. 29, 2018
Debt Instrument
Unamortized Debt Discount							$ 22,733,000	$ 26,033,000
Write-off of deferred financing fees				$ 4,808,000
Gain (loss) on early extinguishment of debt				(10,524,000)
Debt outstanding amount							$ 1,674,500,000	$ 1,782,250,000
Percentage of equity interests pledged							100.00%
Effective Interest Rate	[1]						8.06%	7.63%
Average interest rate on outstanding debt, exclusive the impact of swap							8.06%	7.73%
Average interest rate on outstanding debt, including the impact of swap							7.59%	7.46%
Maximum
Debt Instrument
Pledge percentage of first tier foreign subsidiaries directly owned by company or wholly owned subsidiaries							65.00%
Revolving Credit Facility
Debt Instrument
Credit facility available amount				50,000,000			$ 148,841,000
Total Debt				150,000,000			1,643,692,000	$ 1,746,708,000
Line off credit facility drawn amount							0	0
Unamortized Debt Discount							0	0
Debt outstanding amount							0	$ 0
Line of credit facility, issued but undrawn letters of credit							$ 1,159,000
Effective Interest Rate	[1]						0.00%	4.39%
Percentage of equity interests pledged							0.35%
Consolidated first lien net debt leverage ratio							2.92
Term Loan Facility
Debt Instrument
Debt outstanding amount							$ 1,374,500,000
Credit Facilities
Debt Instrument
Credit Facility, maximum borrowing capacity				1,930,386,000
Total Debt				1,565,000,000			1,674,500,000
Line off credit facility drawn amount				25,000,000
Fees incurred in connection with debt refinancing						$ 53,832,000
Unamortized Debt Discount				30,800,000
Deferred financing costs				5,716,000
Term Loan Facility
Debt Instrument
Total Debt				1,540,000,000			$ 1,374,500,000
Term Loan Facility | Higher of Federal Funds Effective Rate and Overnight Bank Funding Rate
Debt Instrument
Credit facility, interest rate							0.50%
Term Loan Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument
Credit facility, interest rate							1.00%
Debt instrument variable rate floor percent determined option one							0.75%
Effective Interest Rate							4.75%
Term Loan Facility | Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument
Debt instrument variable rate floor percent determined option one							1.75%
Notes due December 1, 2025
Debt Instrument
Total Debt				$ 300,000,000			$ 300,000,000
Debt Instrument Interest Rate Stated Percentage				8.625%			8.625%
Unamortized Debt Discount							$ 0	$ 0
Debt outstanding amount							$ 300,000,000	$ 300,000,000
Effective Interest Rate	[1]						8.62%	8.69%
Debt instrument issued date							Nov. 29, 2017
Debt instrument, due date							Dec. 1, 2025
Debt instrument interest payment term							Interest on the Notes is payable semi-annually on June 1 and December 1 of each year, beginning on June 1, 2018.
Debt Instrument, redemption, description							On or after December 1, 2020, the Company may on any one or more occasions redeem some or all of the Notes at a purchase price equal to 104.313% of the principal amount of the Notes, plus accrued and unpaid interest, if any, to, but not including, the redemption date, such optional redemption price decreasing to 102.156% on or after December 1, 2021 and to 100.000% on or after December 1, 2022.
Notes due December 1, 2025 | Scenario, Forecast
Debt Instrument
Debt Instrument, percentage of principal can be redeemed		108.625%
Notes due December 1, 2025 | Change of Control | Scenario, Forecast
Debt Instrument
Repurchase price of principal amount of notes plus accrued and unpaid interest		101.00%
Notes due December 1, 2025 | Sale of Assets | Scenario, Forecast
Debt Instrument
Repurchase price of principal amount of notes plus accrued and unpaid interest		100.00%
Notes due December 1, 2025 | Debt Instrument Redemption Date, December 1, 2020
Debt Instrument
Debt Instrument, percentage of principal can be redeemed							104.313%
Debt Instrument, redemption date							Dec. 1, 2020
Notes due December 1, 2025 | Debt Instrument Redemption Date, December 1, 2021
Debt Instrument
Debt Instrument, percentage of principal can be redeemed							102.156%
Debt Instrument, redemption date							Dec. 1, 2021
Notes due December 1, 2025 | Debt Instrument Redemption Date, December 1, 2022
Debt Instrument
Debt Instrument, percentage of principal can be redeemed							100.00%
Debt Instrument, redemption date							Dec. 1, 2022
Notes due December 1, 2025 | Maximum | Scenario, Forecast
Debt Instrument
Percent of principal amount of debt that may be redeemed (up to)		40.00%
Senior Secured Tranche B Term Loan | Term Loan Facility
Debt Instrument
Credit Facility, maximum borrowing capacity				$ 1,540,000,000
Write-off of deferred financing fees					$ 267,000
Debt Instrument, maturity year				2024
Prepayment of principal amount			$ 50,000,000
Senior Secured Revolving Credit Facility | Revolving Credit Facility
Debt Instrument
Credit Facility, maximum borrowing capacity				$ 150,000,000
Debt Instrument, maturity year				2022
Revolving Credit Facility
Debt Instrument
Total Debt							$ 0
Revolving Credit Facility | Higher of Federal Funds Effective Rate and Overnight Bank Funding Rate
Debt Instrument
Credit facility, interest rate							0.50%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument
Credit facility, interest rate							1.00%
Effective Interest Rate							2.25%
[1]	Includes amortization of deferred financing costs and debt discount.

Computation of Basic and Dilute

Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Numerator:
Net income attributable to WW International, Inc.	$ 47,086	$ 70,132	$ 90,233	$ 179,964
Denominator:
Weighted average shares of common stock outstanding	67,298	66,701	67,129	66,074
Effect of dilutive common stock equivalents	2,319	3,630	2,235	4,043
Weighted average diluted common shares outstanding	69,617	70,331	69,364	70,117
Earnings Per Share attributable to WW International, Inc.
Basic	$ 0.70	$ 1.05	$ 1.34	$ 2.72
Diluted	$ 0.68	$ 1	$ 1.30	$ 2.57

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Earnings Per Share [Abstract]
Anti-dilutive common stock equivalents excluded from the calculation of diluted earnings per share	1,687	9	1,793	35

Stock Plans - Additional Inform

Stock Plans - Additional Information (Detail) - Performance-based Stock Unit - shares	1 Months Ended		9 Months Ended	12 Months Ended
	Jul. 31, 2017	May 31, 2017	Sep. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Other than options, granted	47,900	98,500	280,100	81,300		289,900
Performance period (years)					3 years
Net debt to EBITDA ratio						450.00%
Debt ratio achievement percentage						166.67%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	21.80%	15.00%	23.00%	9.80%
Effective state income tax expenses			$ 2,257
Tax expense related to foreign jurisdictions			3,242
Tax expense related to global intangible low taxed income			2,998
Reversal of tax reserves			1,375	$ 3,811
Tax expense (benefit) related to foreign derived intangible income			(4,200)
Tax shortfall on share-based awards				(24,632)
Favorable tax return adjustments				3,697
Benefit on closure of subsidiary			$ (746)	$ (1,859)

Income Taxes - Summary of Diffe

Income Taxes - Summary of Differences Between U.S. Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes (net of federal benefit)	0.80%	(0.60%)	1.90%	1.10%
Cessation of operations	0.00%	0.00%	(0.60%)	(0.90%)
Research and development credit	(1.20%)	(0.30%)	(1.10%)	(0.30%)
Tax windfall on share-based awards	(0.30%)	(3.00%)	(0.10%)	(12.40%)
Tax return adjustments related to the 2017 Tax Act	(1.70%)	(3.30%)	(0.90%)	(1.30%)
Reserve for uncertain tax positions	0.00%	(4.60%)	(1.20%)	(1.80%)
GILTI	2.00%	0.00%	2.60%	0.00%
FDII	(4.90%)	0.00%	(3.60%)	0.00%
Impact of foreign operations	3.70%	4.20%	2.80%	3.20%
Other	2.40%	1.60%	2.20%	1.20%
Total effective tax rate	21.80%	15.00%	23.00%	9.80%

Derivative Instruments and He_2

Derivative Instruments and Hedging - Additional Information (Detail) - USD ($)	Jun. 07, 2019	Jun. 11, 2018	Jul. 26, 2013	Sep. 28, 2019	Dec. 29, 2018
Derivative
Maximum length of time hedging forecasted				5 years
Derivative loss included in accumulated other comprehensive income (loss) that are expected to be reclassified into earnings within the next 12 months, net of tax				$ 4,824,000
Derivative loss included in accumulated other comprehensive income (loss) that are expected to be reclassified into earnings within the next 12 months, before tax				$ 6,467,000
Interest Rate Swap
Derivative
Forward-starting interest rate swap, effective date	Apr. 2, 2020	Apr. 2, 2020	Mar. 31, 2014
Forward starting interest rate swap, termination date	Mar. 31, 2024	Mar. 31, 2024	Apr. 2, 2020
Derivative interest rate swap percentage	1.901%	3.1005%		2.41%
Cumulative losses for qualifying hedges reported as a component of accumulated other comprehensive loss net of tax				$ 17,917,000	$ 1,175,000
Cumulative losses for qualifying hedges reported as a component of accumulated other comprehensive loss before tax				24,067,000	1,634,000
Interest Rate Swap | Other Noncurrent Asset
Derivative
Interest rate swap asset					398,000
Interest Rate Swap | Other Current Asset
Derivative
Interest rate swap asset					3,526,000
Interest Rate Swap | Derivative Payable
Derivative
Interest rate swap liability				2,241,000
Interest Rate Swap | Cash Flow Hedging
Derivative
Notional amount	$ 250,000,000	$ 500,000,000	$ 1,500,000,000	1,000,000,000	1,250,000,000
Interest Rate Swap | Cash Flow Hedging | June 30, 2014
Derivative
Notional amount				$ 1,500,000,000
Forward-starting interest rate swap, effective date				Mar. 31, 2014
Interest Rate Swap | Cash Flow Hedging | April 3, 2017
Derivative
Notional amount				$ 1,250,000,000
Forward-starting interest rate swap, effective date				Apr. 3, 2017
Interest Rate Swap | Cash Flow Hedging | April 1, 2019
Derivative
Notional amount				$ 1,000,000,000
Forward-starting interest rate swap, effective date				Apr. 1, 2019
Interest Rate Swap | Cash Flow Hedging | April 2, 2020
Derivative
Notional amount				$ 500,000,000
Forward-starting interest rate swap, effective date				Apr. 2, 2020
Interest Rate Swap | Cash Flow Hedging | June 30, 2021
Derivative
Notional amount				$ 250,000,000
Forward-starting interest rate swap, effective date				Mar. 31, 2021
Future Swap | Derivative Payable
Derivative
Interest rate swap liability				$ 22,039,000	$ 5,578,000

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	Sep. 28, 2019	Dec. 29, 2018	Nov. 29, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value assets, transfer between level 1 to level 2	$ 0	$ 0
Fair value liabilities, transfer between level 1 to level 2	0	0
Fair value assets, transfer between level 2 to level 1	0	0
Fair value liabilities, transfer between level 2 to level 1	0	0
Revolving Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of long-term debt	0	0
Fair value of long-term debt	1,658,608,000	1,757,717,000
Debt outstanding amount	$ 1,643,692,000	$ 1,746,708,000	$ 150,000,000

Aggregate Fair Value of Derivat

Aggregate Fair Value of Derivative Financial Instruments (Detail) - Fair Value, Measurements, Recurring - Interest Rate Swap - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swap liability	$ 24,280	$ 5,578
Interest rate swap asset		3,924
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swap liability	0	0
Interest rate swap asset		0
Fair Value Measurements Using Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swap liability	24,280	5,578
Interest rate swap asset		3,924
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swap liability	$ 0	0
Interest rate swap asset		$ 0

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Thousands		9 Months Ended
		Sep. 28, 2019	Sep. 29, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ (808,943)	$ (1,015,986)
Other comprehensive (loss) income before reclassifications, net of tax	[1]	(15,188)	4,996
Amounts reclassified from accumulated other comprehensive loss, net of tax	[1],[2]	(1,157)	2,098
Adoption of accounting standard	[1]		(2,485)
Net current period other comprehensive (loss) income including noncontrolling interest	[1]	(16,345)	4,609
Less: net current period other comprehensive income (loss) attributable to the noncontrolling interest	[1]	38	406
Ending balance		(723,602)	(845,212)
(Loss) Gain on Qualifying Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(1,175)	(5,392)
Other comprehensive (loss) income before reclassifications, net of tax	[1]	(15,585)	9,248
Amounts reclassified from accumulated other comprehensive loss, net of tax	[1],[2]	(1,157)	2,098
Adoption of accounting standard	[1]		(1,161)
Net current period other comprehensive (loss) income including noncontrolling interest	[1]	(16,742)	10,185
Less: net current period other comprehensive income (loss) attributable to the noncontrolling interest	[1]	0	0
Ending balance	[1]	(17,917)	4,793
Loss on Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(14,582)	(5,075)
Other comprehensive (loss) income before reclassifications, net of tax	[1]	397	(4,252)
Amounts reclassified from accumulated other comprehensive loss, net of tax	[1],[2]	0	0
Adoption of accounting standard	[1]		(1,324)
Net current period other comprehensive (loss) income including noncontrolling interest	[1]	397	(5,576)
Less: net current period other comprehensive income (loss) attributable to the noncontrolling interest	[1]	38	406
Ending balance	[1]	(14,147)	(10,245)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(15,757)	(10,467)
Ending balance	[1]	$ (32,064)	$ (5,452)
[1]	Amounts in parentheses indicate debits
[2]	See separate table below for details about these reclassifications

Reclassifications out of Accumu

Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019		Sep. 29, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (33,118)	$ (35,506)	$ (103,045)		$ (107,238)
Income before income taxes	(60,151)	(82,473)	(116,853)		(199,422)
Provision for income taxes	13,123	12,374	26,834		19,580
Net income	(47,028)	(70,099)	(90,019)		(179,842)
Loss on Qualifying Hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(210)	(210)	1,550	[1]	(2,813)	[1]
Provision for income taxes	53	53	(393)	[1]	715	[1]
Net income	(157)	(157)	1,157	[1]	(2,098)	[1]
Loss on Qualifying Hedges | Interest Rate Contract | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (210)	$ (210)	$ 1,550	[1]	$ (2,813)	[1]
[1]	Amounts in parentheses indicate debits to profit/loss

Segment Data - Additional Infor

Segment Data - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)Segment	Dec. 29, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	4
Operating lease assets | $	$ 146,063	$ 0
Operating Segments | North America
Segment Reporting Information [Line Items]
Segment reportable percentage	52.70%
General Corporate
Segment Reporting Information [Line Items]
Segment reportable percentage	42.20%

Information About Reportable Se

Information About Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 348,567	$ 365,765	$ 1,080,754	$ 1,183,735
Operating income	94,729	118,860	222,099	308,638
Interest expense	33,118	35,506	103,045	107,238
Other expense, net	1,460	881	2,201	1,978
Provision for income taxes	13,123	12,374	26,834	19,580
Net income	47,028	70,099	90,019	179,842
Net loss attributable to the noncontrolling interest	58	33	214	122
Net income attributable to WW International, Inc.	47,086	70,132	90,233	179,964
Depreciation and amortization	13,046	13,028	40,419	38,924
Operating Segments
Segment Reporting Information [Line Items]
Operating income	121,383	144,387	299,457	384,129
Depreciation and amortization	9,811	9,999	29,615	30,283
General corporate expenses
Segment Reporting Information [Line Items]
General corporate expenses	26,654	25,527	77,358	75,491
Depreciation and amortization	3,235	3,029	10,804	8,641
North America
Segment Reporting Information [Line Items]
Net revenue	243,684	255,281	749,341	819,007
North America | Operating Segments
Segment Reporting Information [Line Items]
Operating income	83,998	99,513	216,281	273,905
Depreciation and amortization	9,048	9,102	27,434	27,744
Continental Europe
Segment Reporting Information [Line Items]
Net revenue	71,138	72,394	224,623	236,518
Continental Europe | Operating Segments
Segment Reporting Information [Line Items]
Operating income	32,679	36,482	73,518	86,890
Depreciation and amortization	496	370	1,272	989
United Kingdom
Segment Reporting Information [Line Items]
Net revenue	22,933	25,356	72,068	84,850
United Kingdom | Operating Segments
Segment Reporting Information [Line Items]
Operating income	3,271	5,743	6,829	15,646
Depreciation and amortization	164	383	588	1,098
Other
Segment Reporting Information [Line Items]
Net revenue	10,812	12,734	34,722	43,360
Other | Operating Segments
Segment Reporting Information [Line Items]
Operating income	1,435	2,649	2,829	7,688
Depreciation and amortization	$ 103	$ 144	$ 321	$ 452

Related Party - Additional Info

Related Party - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Ms. Winfrey and her related entities
Related Party Transaction [Line Items]
Related Party Transaction, service provided by related party	$ 662	$ 157	$ 2,665	$ 2,145
Related Party, advertising expenses	330
Ms. Winfrey
Related Party Transaction [Line Items]
Accounts payable to related parties	$ 246		$ 246		$ 62
Number of shares purchased from related party			954
Stock options exercised			1,405

Restructuring - Additional Info

Restructuring - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Restructuring Cost And Reserve [Line Items]
Expenses	$ 6,331
Expenses, after tax	4,727
Payments for expenses	4,504
Provisions	121
Restructuring remaining liability	1,706
Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Expenses	1,425
Selling, General and Administrative Expense
Restructuring Cost And Reserve [Line Items]
Expenses	$ 4,906