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Intangible Assets (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018   $ 145,400,000
2019   143,300,000
2020   133,000,000
2021   131,600,000
2022   129,500,000
Goodwill, Impairment Loss $ 24,400,000 $ 0