INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 27, 2021	Feb. 29, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 4,282.8	$ 4,215.9
Accumulated amortization	(2,261.0)	(2,214.8)
Net	2,021.8	2,001.1
Liquor licenses and restricted covenants	87.0	86.1
Total intangible assets, gross	4,369.8	4,302.0
Total intangible assets, net	$ 2,108.8	2,087.2
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	$ 1,941.7	1,912.1
Accumulated amortization	(312.5)	(264.6)
Net	$ 1,629.2	1,647.5
Customer prescription files
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (Years)	5 years
Gross carrying amount	$ 1,511.3	1,472.1
Accumulated amortization	(1,458.6)	(1,440.9)
Net	52.7	31.2
Internally developed software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	777.5	780.0
Accumulated amortization	(441.1)	(465.2)
Net	$ 336.4	314.8
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	$ 52.3	51.7
Accumulated amortization	(48.8)	(44.1)
Net	$ 3.5	$ 7.6
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