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Net Income per Common Share - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Earnings Per Share [Line Items]
Anti-dilutive common shares	151,625	2,440,525	3,836,838
Anti-dilutive common shares exercise price, minimum	$ 37.65	$ 28.49	$ 26.85
Anti-dilutive common shares exercise price, maximum	$ 46.02	$ 39.58	$ 39.58
Contingently issuable awards	1,752,200	335,200

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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