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Acquisition of Trade Secret - Additional Information (Detail)
$ in Thousands, AUD in Millions
 3 Months Ended
Oct. 24, 2015
USD ($)
Store
Oct. 24, 2015
AUD
Apr. 30, 2016
USD ($)
Business Acquisition [Line Items]      
Acquisition of Trade Secret, net of cash received     $ 2,324
Trade Secret      
Business Acquisition [Line Items]      
Business acquisition,date of acquisition Oct. 24, 2015 Oct. 24, 2015  
Business acquisition, number of operating stores acquired | Store 35    
Acquisition of Trade Secret, net of cash received $ 59,400 AUD 83.3  
Identifiable amortizable intangible assets $ 12,000    
Identifiable intangible assets, amortization period 10 years 10 years  
Goodwill acquired $ 25,000