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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Jan. 31, 2013
Y
Store
Jan. 31, 2012
Jan. 31, 2011
Commitments and Contingencies Disclosure [Line Items]      
Number of lease commitment not opened 31    
Commitments for un-fulfilled purchase orders $ 343,514,000    
Commitments with construction contractors 4,670,000    
U.S. based employees age limit to participate in 401(k) Saving Plan 18    
Employer matching contribution per employee 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 $ 1,483,000 $ 1,365,000 $ 1,308,000
Minimum
      
Commitments and Contingencies Disclosure [Line Items]      
Percentage of compensation deferred by employees under Saving Plan 1.00%    
Maximum
      
Commitments and Contingencies Disclosure [Line Items]      
Percentage of compensation deferred by employees under Saving Plan 25.00%