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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Jan. 31, 2017
USD ($)
$ / Employee_Contribution
Store
Jan. 31, 2016
USD ($)
Jan. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Line Items]      
Number of lease commitment not opened | Store 13    
Commitments for un-fulfilled purchase orders $ 418,221    
Commitments with construction contractors $ 6,409    
U.S. based employees age limit to participate in 401(k) Saving Plan 18 years    
Employer matching contribution per employee | $ / Employee_Contribution 0.25    
Percentage of employee contribution for first threshold limit of employer contribution 6.00%    
Employees contribution percentage vested 100.00%    
Percentage of employers contribution per year vested 20.00%    
Company's contribution to Savings Plan $ 2,455 $ 2,121 $ 1,708
Nonqualified Deferred Compensation Plan      
Commitments and Contingencies Disclosure [Line Items]      
Employer matching contribution per employee | $ / Employee_Contribution 0.25    
Percentage of employee contribution for first threshold limit of employer contribution 6.00%    
Employees contribution percentage vested 100.00%    
Percentage of employers contribution per year vested 100.00%    
Company's contribution to Savings Plan $ 84 105 $ 100
Deferred compensation obligation 4,673 4,673  
Aggregate market value of investments $ 4,363 $ 4,363  
Minimum      
Commitments and Contingencies Disclosure [Line Items]      
Operating lease, renewal option 5 years    
Percentage of compensation deferred by employees under Saving Plan 1.00%    
Maximum      
Commitments and Contingencies Disclosure [Line Items]      
Operating lease, renewal option 10 years    
Percentage of compensation deferred by employees under Saving Plan 25.00%