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Schedule of Share-Based Compensation Expense (Income) Included in Selling, General and Administrative Expenses in Condensed Consolidated Statements of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 15,742 $ 10,892 $ 3,068
Stock Options
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,621 2,214 2,886
Stock Appreciation Rights(SARs)
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,918 2,578 1,111
Performance Stock Units
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 9,956 [1],[2] 6,124 [1],[2] (959) [1],[2]
Restricted Stock Units
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 247 $ (24) $ 30
[1] Includes the reversal of $3,418 of previously recognized compensation expense in fiscal 2013, related to 320,200 PSU's that will not vest as the achievement of the related performance target is not probable
[2] Includes the reversal of $8,800 of previously recognized compensation expense in fiscal 2012, related to 1,054,466 PSU's, granted to a former executive officer of the Company, that will not vest due to the service requirement not being met.