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Discontinued Operations - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 14, 2019 USD ($) | Apr. 15, 2018 USD ($) | Apr. 14, 2019 USD ($) extnsion_option | Apr. 15, 2018 USD ($) | Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal |  |  | 12 months |  |
Discontinued Operation, Period Of Continuing Involvement After Disposal, Number Of Extension Options | extnsion_option |  |  | 2 |  |
Discontinued Operation, Period Of Continuing Involvement After Disposal, Service Period Extension Option |  |  | 3 months |  |
Other Nonrecurring Income | $ 1.9 | $ 1.1 | $ 5.6 | $ 1.1 |
Other Nonrecurring Expense |  |  | 35.4 |  |
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable | 2.8 |  | 2.8 |  |
Lease Guarantee | $ 35.3 |  | $ 35.3 |  |
Term Loan [Member] | Qdoba |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Repayments of Debt |  |  |  |  | $ 260.0

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