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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	$ 30,926
Weighted Average Years	2 years 7 months 6 days
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	1,707
Weighted Average Years	1 year
Stock Appreciation Rights(SARs)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	7,588
Weighted Average Years	2 years 9 months 18 days
Performance Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	21,371
Weighted Average Years	2 years 8 months 12 days
Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	$ 260
Weighted Average Years	1 year 2 months 12 days