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Net Income per Common Share - Additional Information (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares	319,883	556,375	1,016,733	857,331
Anti-dilutive common shares exercise price, minimum	$ 28.10	$ 35.41	$ 25.60	$ 28.10
Anti-dilutive common shares exercise price, maximum	$ 46.02	$ 46.02	$ 46.02	$ 46.02
Performance Stock Units (PSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares			2,610,295	2,442,345

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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