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