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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	$ 58,312
Weighted Average Years	3 years 4 months 24 days
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	1,186
Weighted Average Years	9 months 18 days
Stock Appreciation Rights(SARs)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	6,752
Weighted Average Years	2 years 6 months
Performance Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	50,181
Weighted Average Years	3 years 7 months 6 days
Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Cost	$ 193
Weighted Average Years	1 year