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Discontinued Operations (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 21, 2018
USD ($)
extnsion_option
Dec. 31, 2018
USD ($)
Sep. 29, 2019
USD ($)
Sep. 30, 2018
USD ($)
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