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Stock-Based Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based expense recognized $ 6,256 $ 5,858 $ 15,585 $ 15,081
Income tax benefit recognized $ 2,441 $ 2,254 $ 6,094 $ 5,809