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Debt (Details) - USD ($)
12 Months Ended
Mar. 28, 2017
Apr. 27, 2016
Nov. 02, 2015
Feb. 03, 2017
Jan. 29, 2016
Jan. 30, 2015
Sep. 14, 2015
Aug. 03, 2015
Jun. 30, 2015
Debt Instrument [Line Items]                  
Conversion of convertible notes to common stock       $ 28,125,000 $ 0 $ 0      
Common Stock, Class A                  
Debt Instrument [Line Items]                  
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
Convertible notes outstanding             $ 22,500,000    
Fair value of convertible debt         28,000,000        
Conversion of convertible notes to common stock   $ 28,100,000              
Change in fair value   $ 100,000     $ 5,500,000        
Convertible Notes Payable | 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              
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 30,000,000            
Initial term     1 year            
Line of credit, outstanding balance       $ 0          
Unused capacity, commitment fee percentage       0.35%          
Commitment fee       $ 80,000          
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       1.60%          
Subsequent Event | Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 30,000,000                
Additional borrowing capacity $ 30,000,000                
Extension of term 1 year