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Debt (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 27, 2016
Nov. 02, 2015
May 05, 2017
Nov. 03, 2017
Jan. 29, 2016
Feb. 03, 2017
Sep. 14, 2015
Aug. 03, 2015
Jun. 30, 2015
Debt Instrument [Line Items]                  
Convertible notes outstanding             $ 22,500,000    
Common Stock, Class A                  
Debt Instrument [Line Items]                  
Shares issued in conversion (in shares) 2,008,924                
Convertible notes $ 22,500,000                
Conversion price (usd per share) $ 11.20                
Conversion price, percent of IPO price 80.00%                
Price per share (usd per share) $ 14.00                
Convertible Notes Payable                  
Debt Instrument [Line Items]                  
Maximum principal amount of convertible notes to be sold             $ 500,000.0 $ 22,000,000 $ 25,000,000
Fair value of the convertible notes         $ 28,000,000        
Change in fair value $ 100,000       $ 5,500,000        
Conversion of convertible notes to common stock $ 28,100,000                
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   $ 30,000,000              
Debt instrument, term   1 year              
Debt instrument, term, extension     1 year            
Maximum amount outstanding during period   $ 30,000,000              
Additional borrowing capacity   $ 30,000,000              
Line of credit, outstanding balance       $ 0   $ 0      
Unused capacity, commitment fee percentage       0.35%          
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       1.60%