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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Mar. 26, 2022
Mar. 27, 2021
Statement of Comprehensive Income [Abstract]        
Net unrealized loss $ 6.5 $ 1.4 $ 9.1 $ 1.2