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Pay vs Performance Disclosure - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2023
Sep. 24, 2023
Dec. 25, 2022
Sep. 25, 2022
Dec. 31, 2023
Dec. 25, 2022
Pay vs Performance Disclosure            
Net loss $ (144.7) $ (395.7) $ (90.9) $ (26.2) $ (540.4) $ (117.1)