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Shareholders' Equity | 6 Months Ended
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Jul. 31, 2018
Equity [Abstract] |
Shareholders' Equity | 9. Shareholders’ Equity Share repurchase activity under the Company’s share repurchase programs was as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 31, |  |  | July 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Number of common shares repurchased and subsequently retired |  |  | — |  |  |  | 5,009,705 |  |  |  | — |  |  |  | 5,009,705 |
Total cost |  | $ | — |  |  | $ | 90,511 |  |  | $ | — |  |  | $ | 90,511 |
Average cost per share, including commissions |  | $ | — |  |  | $ | 18.07 |  |  | $ | — |  |  | $ | 18.07 |
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 July 31, 2018. During the six months ended July 31, 2018, the Company acquired and subsequently retired 158,018 common shares at a total cost of $5,924 from employees to meet minimum statutory tax withholding requirements. During the six months ended July 31, 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. + References 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 + Details
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