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Discontinued Operations (Narrative) (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 21, 2018 extnsion_option | Dec. 31, 2018 USD ($) | Sep. 29, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 19, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  | $ 298.5
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 |  |  | $ 7.0 | $ 7.9 |
Other nonrecurring expense |  | $ 35.4 |  |  |
Disposal group, including discontinued operation, accrued income tax payable |  |  |  | $ 2.8 |
Term Loan | 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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