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Schedule of Share-Based Compensation Expense Included in Selling, General and Administrative Expenses in Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 14,517 $ 18,291 $ 15,623
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 897 1,002 841
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 142 240 1,295
Performance Stock Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense [1],[2],[3] 3,562 12,349 13,464
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 9,916 $ 4,700 $ 23
[1] Includes the reversal of $11,515 of previously recognized compensation expense in fiscal 2018, related to 871,779 PSU’s that will not vest as the achievement of the related performance target is not probable.
[2] Includes the reversal of $7,908 of previously recognized compensation expense in fiscal 2017, related to 505,510 PSU’s that will not vest as the achievement of the related performance target is not probable.
[3] Includes the reversal of $967 of previously recognized compensation expense in fiscal 2016, related to 50,004 PSU’s that will not vest as the achievement of the related performance target is not probable.