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Leases (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 25, 2021
Jun. 26, 2020
Jun. 25, 2021
Jun. 26, 2020
Sep. 25, 2020
Lessor, Lease, Description [Line Items]          
Lesse lease term 11 years   11 years    
Lessee lease renewal term 5 years   5 years    
Lessee lease termination period     1 year    
Variable operating lease income $ 2.7 $ (0.9) $ 3.5 $ 10.2  
Fixed operating lease income 1.0 $ 1.0 3.2 $ 2.5  
Unguaranteed residual value of sales-type leases $ 0.8   $ 0.8   $ 0.7
Minimum [Member]          
Lessor, Lease, Description [Line Items]          
Lessor lease term 4 years   4 years    
Lessor lease renewal term 1 year   1 year    
Maximum [Member]          
Lessor, Lease, Description [Line Items]          
Lessor lease term 10 years   10 years    
Lessor lease renewal term 5 years   5 years