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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Feb. 01, 2017
Apr. 30, 2017
Apr. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative reduction to beginning retained earning $ (984)    
Recognition of previously unrecognized excess tax benefit $ 224    
Decrease in net cash used in financing activities     $ (150)
Increase in net cash used in operating activities     $ 150
Excess tax deficit   $ (442)