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Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Aug. 03, 2019
USD ($)
segment
performance_obligation
Jul. 28, 2018
USD ($)
Jul. 29, 2017
USD ($)
Aug. 04, 2019
USD ($)
Jul. 29, 2018
USD ($)
Products And Services [Line Items]          
Number of operating segments | segment 1        
Number of reportable segments | segment 1        
Inventory reserve $ 25,500,000 $ 17,600,000      
Number of performance obligations | performance_obligation 1        
Refund reserve $ 3,100,000 2,300,000      
Contractual liabilities 11,997,000 8,870,000      
Advertising expenses 152,100,000 102,100,000 $ 70,500,000    
Client referral credits 1,600,000 2,700,000      
Stock based compensation related to periods prior to IPO 500,000        
Cumulative effect of new accounting principle in period of adoption [1]         $ 35,000
Upfront Styling Fee          
Products And Services [Line Items]          
Contractual liabilities 9,600,000 7,600,000      
Styling Fees And Exchanges          
Products And Services [Line Items]          
Deferred revenue 0 200,000      
Style Pass Annual Fees          
Products And Services [Line Items]          
Contractual liabilities $ 2,300,000 1,100,000      
Options          
Products And Services [Line Items]          
Service period 24 months        
Performance period 12 months        
Accounting Standards Update 2014-09 | Difference Between Revenue Guidance In Effect Before And After Topic 606          
Products And Services [Line Items]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 1,400,000        
Deferred Revenue          
Products And Services [Line Items]          
Contractual liabilities 12,000,000.0 8,900,000      
Revenue recognized 8,600,000        
Gift Card Liability          
Products And Services [Line Items]          
Contractual liabilities 7,200,000 6,800,000      
Revenue recognized 2,800,000        
Other Current Liabilities          
Products And Services [Line Items]          
Contractual liabilities 1,600,000 $ 2,700,000      
Revenue recognized $ 700,000        
Retained Earnings          
Products And Services [Line Items]          
Cumulative effect of new accounting principle in period of adoption [1]         35,000
Retained Earnings | Accounting Standards Update 2014-09          
Products And Services [Line Items]          
Cumulative effect of new accounting principle in period of adoption         400,000
Retained Earnings | Accounting Standards Update 2014-09 | Gift Cards          
Products And Services [Line Items]          
Cumulative effect of new accounting principle in period of adoption         300,000
Retained Earnings | Accounting Standards Update 2014-09 | Product Exchanges          
Products And Services [Line Items]          
Cumulative effect of new accounting principle in period of adoption         100,000
Retained Earnings | Accounting Standards Update 2016-16          
Products And Services [Line Items]          
Cumulative effect of new accounting principle in period of adoption         $ 400,000
Forecast | Minimum | Accounting Standards Update 2016-02          
Products And Services [Line Items]          
Right-of-use asset       $ 130,000,000  
Lease liabilities       155,000,000  
Forecast | Maximum | Accounting Standards Update 2016-02          
Products And Services [Line Items]          
Right-of-use asset       140,000,000  
Lease liabilities       $ 165,000,000  
[1] See Note 2, Summary of Significant Accounting Policies, of the Notes to the Condensed Consolidated Financial Statements for more details on the cumulative effect of adopting accounting standards.