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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Statement of Comprehensive Income [Abstract]        
Change in value of hedged interest rate swap and interest rate cap, tax $ 1.4 $ (8.1) $ 1.2 $ (6.4)