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Shareholders' Equity	3 Months Ended
	Apr. 30, 2018
Equity [Abstract]
Shareholders' Equity	9. Shareholders’ Equity On February 23, 2015, the Company’s Board of Directors authorized the repurchase of 20,000,000 common shares under a share repurchase program; all shares were repurchased by the end of August 2017. On August 22, 2017, the Company’s Board of Directors authorized the repurchase of an additional 20,000,000 common shares under a share repurchase program, of which 17,902,153 common shares were remaining as of April 30, 2018. During the three months ended April 30, 2018 and April 30, 2017, there were no common shares repurchased under a share repurchase program. During the three months ended April 30, 2018, the Company acquired and subsequently retired 138,310 common shares at a total cost of $5,047 from employees to meet minimum statutory tax withholding requirements. During the three months ended April 30, 2017, the Company acquired and subsequently retired 43,423 common shares at a total cost of $1,142 from employees to meet minimum statutory tax withholding requirements.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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