Significant Accounting Policies - Additional Information (Details) $ in Thousands		3 Months Ended	12 Months Ended
		Oct. 27, 2018	Jul. 31, 2021 USD ($) segment performanceObligation	Aug. 01, 2020 USD ($)	Aug. 03, 2019 USD ($)	Aug. 04, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jul. 28, 2018 USD ($)
Products And Services [Line Items]
Deferred income taxes and valuation allowance			$ 64	$ 22,880	$ (8,203)
Number of operating segments | segment			1
Number of reportable segments | segment			1
Inventory reserve			$ 43,400	34,400
Number of performance obligations | performanceObligation			1
Refund reserve			$ 11,700	5,000
Advertising expenses			174,700	167,800	152,100
Operating lease right-of-use assets			118,565	132,615
Deferred rent previously recorded					25,700
Operating lease liabilities, current			25,702	24,333
Operating lease liabilities, noncurrent			121,623	140,175
Cumulative effect of adopting accounting standards			460,849	401,037	396,000			$ 315,072
Revenue, net			2,101,258	$ 1,711,733	1,577,558
Accounting Standards Update [Extensible List]		Accounting Standards Update 2014-09 [Member]		Accounting Standards Update 2016-02
Revision of Prior Period, Reclassification, Adjustment
Products And Services [Line Items]
Deferred tax assets valuation allowance establishment				$ 42,300
Deferred income taxes and valuation allowance				42,300
Difference Between Revenue Guidance In Effect Before And After Topic 606
Products And Services [Line Items]
Revenue, net					1,400
Cumulative effect of adopting accounting standards
Products And Services [Line Items]
Cumulative effect of adopting accounting standards	[1]							35
Accounting Standards Update 2016-02
Products And Services [Line Items]
Operating lease right-of-use assets						$ 133,000
Operating lease liabilities, current						22,000
Operating lease liabilities, noncurrent						$ 136,700
Retained Earnings
Products And Services [Line Items]
Cumulative effect of adopting accounting standards			40,681	$ 49,557	$ 116,674			79,758
Retained Earnings | Cumulative effect of adopting accounting standards
Products And Services [Line Items]
Cumulative effect of adopting accounting standards							$ 400	$ 35	[1]
Retained Earnings | Cumulative effect of adopting accounting standards | Gift Cards
Products And Services [Line Items]
Cumulative effect of adopting accounting standards							300
Retained Earnings | Cumulative effect of adopting accounting standards | Product Exchanges
Products And Services [Line Items]
Cumulative effect of adopting accounting standards							$ 100
Prepaid Expenses and Other Current Assets
Products And Services [Line Items]
Accrued interest receivable			$ 1,000

[1] See Note 2, Summary of Significant Accounting Policies, of the Notes to the Consolidated Financial Statements for more details on the cumulative effect of adopting accounting standards.