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Stock Compensation - Schedule of Intrinsic Value of Equity Awards Exercised (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Stock Compensation [Abstract]        
Intrinsic value of awards exercised $ 19,530 $ 17,631 $ 28,028 $ 42,262