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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, 2015
Jan. 31, 2014
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 16,736us-gaap_ShareBasedCompensation $ 15,742us-gaap_ShareBasedCompensation $ 10,892us-gaap_ShareBasedCompensation
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 1,377us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,621us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,214us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,244us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 2,918us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 2,578us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 12,991us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1],[2] 9,956us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1],[2] 6,124us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1],[2]
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 124us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 247us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ (24)us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1] Includes the reversal of $1,396 of previously recognized compensation expense in fiscal 2015, related to 163,336 PSU's that will not vest as the achievement of the related performance target is not probable.
[2] 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.