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Derivatives - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in other comprehensive income, net of taxes: $ (0.7) $ (4.0)
Changes in value of hedged interest rate swaps and interest rate caps, net of tax of $(0.2) for the three months ended December 26, 2020 and $1.7 for the three months ended December 28,2019. 0.7 4.0
Interest Rate Swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in other comprehensive income, net of taxes: (0.9) 4.3
Interest rate cap agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Changes in value of hedged interest rate swaps and interest rate caps, net of tax of $(0.2) for the three months ended December 26, 2020 and $1.7 for the three months ended December 28,2019. $ (0.2) $ (0.3)