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Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Total cost			$ 47,836
Share repurchase program
Equity, Class of Treasury Stock [Line Items]
Number of common shares repurchased and subsequently retired	1,000,000	3,699,949	1,324,700	10,737,090
Total cost	$ 35,083	$ 111,909	$ 45,787	$ 365,527
Average cost per share, including commissions	$ 35.08	$ 30.25	$ 34.56	$ 34.04

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Number of shares that have been repurchased and retired during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Total cost of shares repurchased divided by the total number of shares repurchased.

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