Share Repurchase Programs - Additional Information (Detail) - USD ($) |
Feb. 29, 2016 |
Feb. 28, 2015 |
Oct. 31, 2014 |
Oct. 31, 2013 |
Feb. 28, 2013 |
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Equity [Abstract] | |||||
Common stock repurchase program, authorized amount | $ 50,000,000 | $ 75,000,000 | $ 25,000,000 | $ 50,000,000 | $ 50,000,000 |