LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 23, 2019
Leases [Abstract]
Gains on sale leaseback transactions, net	$ 0.0	$ 487.1	$ 362.5
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	973.7	995.8
Operating cash flows from finance leases	70.5	79.8
Financing cash flows from finance leases	79.9	109.3	$ 97.5
Right-of-use assets obtained in exchange for operating lease obligations	763.1	1,195.2
Right-of-use assets obtained in exchange for finance lease obligations	35.8	0.0
Impairment of right-of-use operating lease assets	15.9	15.4
Impairment of right-of-use finance lease assets	$ 6.3	$ 6.1
Weighted average remaining lease term - operating leases	11 years 8 months 12 days	12 years 1 month 6 days
Weighted average remaining lease term - finance leases	8 years 9 months 18 days	9 years
Weighted average discount rate - operating leases	6.70%	7.00%
Weighted average discount rate - finance leases	12.30%	13.70%