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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	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 4,986	$ 4,021	$ 12,411	$ 10,663
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	677	426	2,202	1,418
Stock Appreciation Rights(SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	753	664	2,280	1,833
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	3,489	2,928	7,748	7,421
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 67	$ 3	$ 181	$ (9)