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Description of Business (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Income tax benefit resulting from early adoption $ 7,603 $ 5,561 $ 10,164 $ 9,286
Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]        
Income tax benefit resulting from early adoption     $ (300)