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Insurance - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2019 | Apr. 30, 2019 | Jul. 31, 2019 | Jul. 31, 2018
Schedule of Other Liabilities [Line Items] |  |  |  |
Self insurance retention amount per-claim | $ 1.0 |  | $ 1.0 |
Insurance policy coverage, general and automobile liability losses | 200.0 |  | 200.0 |
Insurance policy coverage, property damage | 75.0 |  | 75.0 |
Decrease in total reserve claims | (3.0) |  |  |
Change in reserves for insurance claims |  | $ 5.0 | 2.0 | $ 10.0
Insurance reserve adjustment, amount lower than prior year adjustment |  |  | (8.0) |
Minimum |  |  |  |
Schedule of Other Liabilities [Line Items] |  |  |  |
Primary policy limit | 1.0 |  | 1.0 |
Maximum |  |  |  |
Schedule of Other Liabilities [Line Items] |  |  |  |
Primary policy limit | 5.0 |  | 5.0 |
Self insurance retention amount per-claim, medical plan | $ 0.5 |  | $ 0.5 |

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- Definition Decrease In Total Reserve Claims + References No definition available. + Details
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- Definition Increase in Total Reserve Claims + References No definition available. + Details
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Balance Type: | credit
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- Definition Represents commercial insurance umbrella policies that cover general liability and automobile liability losses above primary limits. + References No definition available. + Details
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- Definition Insurance Reserve, Adjustment Less Than Or (Greater Than) Prior Year Adjustment, Amount + References No definition available. + Details
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- Definition Represents the policy limit provided by the insurance program for property damage risks. + References No definition available. + Details
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Balance Type: | debit
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- Definition Schedule of Other Liabilities [Line Items] + References No definition available. + Details
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- Definition Self Insured Retention Amount Per Occurrence + References No definition available. + Details
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- Definition Self Insured Retention Amount Per Participant Per Year For Certain Employee Medical And Dental Programs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the policy limit provided by the insurance program for workers' compensation, general liability, and other insurable risks. + References No definition available. + Details
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Balance Type: | debit
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- Details
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- Details
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