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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income Tax (Benefit) Expense $ 40,938 $ 74,571 $ 40,429 $ 113,936
Accounting Standards Update 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income Tax (Benefit) Expense     $ (4,000)