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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