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Net Income per Common Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares	879,600	204,500	1,003,647	101,500
Anti-dilutive common shares exercise price, minimum	$ 37.02	$ 39.40	$ 35.12	$ 39.40
Anti-dilutive common shares exercise price, maximum	$ 46.02	$ 46.02	$ 46.02	$ 46.02
Performance Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares			2,200,434	1,751,100

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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