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SHAREHOLDERS' DEFICIT (Effect of Adoption of ASC 842) (Details) - USD ($)
$ in Millions
Mar. 24, 2021
Dec. 23, 2020
Sep. 23, 2020
Jun. 24, 2020
Mar. 25, 2020
Dec. 25, 2019
Sep. 25, 2019
Jun. 26, 2019
Shareholders' Deficit $ (390.6) $ (444.1) $ (465.1) $ (479.1) $ (574.7) $ (568.9) $ (585.1) $ (778.2)
Cumulative Effect, Period of Adoption, Adjustment | ASC 842 Leases [Member]                
Shareholders' Deficit               195.9
(Accumulated Deficit) Retained Earnings [Member]                
Shareholders' Deficit $ (340.9) $ (374.8) $ (386.8) $ (397.5) $ (347.9) $ (364.7) $ 2,967.4 2,771.2
(Accumulated Deficit) Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment | ASC 842 Leases [Member]                
Shareholders' Deficit               $ 195.9