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Credit Facility - Interest Rate Swaps (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Nov. 01, 2018 | Oct. 31, 2018
Line of Credit Facility [Line Items] |  |  |  |  |  |
Net gains from cash flow hedges recorded in accumulated other comprehensive loss, net of tax | $ 8,900,000 |  | $ 8,900,000 |  |  | $ 17,800,000
Interest expense | 12,800,000 | $ 13,800,000 | 26,300,000 | $ 28,100,000 |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, gross | 2,400,000 |  | 2,400,000 |  |  |
Tax to be reclassified during next 12 months | 1,000,000 |  | 1,000,000 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Tax related to amounts in accumulated other comprehensive loss | 3,800,000 |  | 3,800,000 |  |  | $ 7,100,000
Interest expense | 1,000,000 |  | 2,100,000 |  |  |
Interest expense, net of taxes | $ 400,000 |  | $ 800,000 |  |  |
Interest Rate Swap, Maturity April 30, 2021 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 90,000,000 |
Derivative, fixed interest rate (percent) |  |  |  |  | 2.83% |
Interest Rate Swap, Maturity October 31, 2021 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 90,000,000 |
Derivative, fixed interest rate (percent) |  |  |  |  | 2.84% |
Interest Rate Swap, Maturity April 30, 2022 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 130,000,000 |
Derivative, fixed interest rate (percent) |  |  |  |  | 2.86% |
Interest Rate Swap, Maturity September 1, 2022 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 130,000,000 |
Derivative, fixed interest rate (percent) |  |  |  |  | 2.84% |

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