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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Income Taxes [Line Items]      
Net deferred tax assets $ 66,834 $ 41,120  
Net deferred tax assets, non-current 38,061 26,406  
Unrecognized tax benefit that, if recognized, would impact the effective tax rate 2,416 3,861  
Recognized benefit/(expense) in interest and penalties 1,992 (541) 1,334
Accrued amounts for payment of interest and penalties 1,078 3,070  
Unrecognized tax benefits, lower bound 0    
Unrecognized tax benefits, upper bound 2,007    
U.S. Federal
      
Income Taxes [Line Items]      
Net deferred tax assets 39,513 26,555  
Net operating loss carryforwards 2,979    
U.S. Federal | Minimum
      
Income Taxes [Line Items]      
Expiration date 2017    
U.S. Federal | Maximum
      
Income Taxes [Line Items]      
Expiration date 2033    
State and Local Jurisdiction
      
Income Taxes [Line Items]      
Net deferred tax assets 17,092 11,436  
Foreign Jurisdictions
      
Income Taxes [Line Items]      
Net deferred tax assets 10,229 3,129  
Net operating loss carryforwards 9,732    
Undistributed earnings $ 204,262