INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 26, 2022	Feb. 27, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 4,551.1	$ 4,282.8
Accumulated amortization	(2,354.1)	(2,261.0)
Total	2,197.0	2,021.8
Liquor licenses and restricted covenants	88.0	87.0
Total intangible assets, gross	4,639.1	4,369.8
Total intangible assets, net	$ 2,285.0	2,108.8
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	40 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	40 years
Gross carrying amount	$ 1,935.8	1,941.7
Accumulated amortization	(361.9)	(312.5)
Total	$ 1,573.9	1,629.2
Customer prescription files
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	5 years
Gross carrying amount	$ 1,430.8	1,511.3
Accumulated amortization	(1,375.8)	(1,458.6)
Total	55.0	52.7
Internally developed software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,126.3	777.5
Accumulated amortization	(564.3)	(441.1)
Total	$ 562.0	336.4
Internally developed software | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	3 years
Internally developed software | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	5 years
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 58.2	52.3
Accumulated amortization	(52.1)	(48.8)
Total	$ 6.1	$ 3.5
Other intangible assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	3 years
Other intangible assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	6 years