Significant Accounting Policies - Summary of Contractual Liabilities and Revenue Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 01, 2020	Jul. 31, 2021
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 13,059	$ 18,154
Total deferred revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue	13,059	18,154
Gift card liability
Deferred Revenue Arrangement [Line Items]
Deferred revenue	8,590	9,903
Referral credits
Deferred Revenue Arrangement [Line Items]
Deferred revenue	2,577	1,231
Revenue recognized	1,906
Upfront styling fees
Deferred Revenue Arrangement [Line Items]
Deferred revenue	9,119	11,989
Revenue recognized	9,110
Style Pass annual fees
Deferred Revenue Arrangement [Line Items]
Deferred revenue	2,711	3,474
Revenue recognized	2,703
Freestyle orders
Deferred Revenue Arrangement [Line Items]
Deferred revenue	1,229	$ 2,691
Revenue recognized	947
Gift card liability
Deferred Revenue Arrangement [Line Items]
Revenue recognized	$ 2,876