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Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2017	Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Total cost		$ 91,653
Share repurchase program
Equity, Class of Treasury Stock [Line Items]
Number of common shares repurchased and subsequently retired	5,009,705	5,009,705	324,700
Total cost	$ 90,511	$ 90,511	$ 10,704
Average cost per share, including commissions	$ 18.07	$ 18.07	$ 32.97

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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Total cost of shares repurchased divided by the total number of shares repurchased.

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