LEASES - Sale Leaseback Transactions (Details) $ in Millions	3 Months Ended						12 Months Ended
	Sep. 07, 2019 USD ($)	Sep. 07, 2019 USD ($)	Sep. 07, 2019 USD ($)	Sep. 07, 2019 USD ($) store	Sep. 07, 2019 USD ($) transaction	Sep. 07, 2019 USD ($) distribution_center	Feb. 29, 2020 USD ($)	Feb. 23, 2019 USD ($) distribution_center	Feb. 24, 2018 USD ($) store
Sale Leaseback Transaction [Line Items]
Number of sale leaseback transactions | transaction					3
Number of properties sold and leaseback				53		1			94
Aggregate purchase price, exclusive of closing costs		$ 931.3						$ 950.0	$ 962.0
Annual rental payment increase period one	15 years							15 years
Annual rental payment increase period two	20 years							20 years
Annual rental payment		53.0						$ 55.0	65.0
Gross deferred gain on sale leaseback	$ 463.6	463.6	$ 463.6	$ 463.6	$ 463.6	$ 463.6			$ 360.1
Operating lease right-of-use assets	$ 602.5	$ 602.5	$ 602.5	$ 602.5	$ 602.5	$ 602.5	$ 5,867.4
Gains on sale leaseback transactions, net							$ 487.1	$ 362.5
Lease term of sale-leaseback									20 years
Sale leaseback transaction, number of qualifying stores | store									80
Sale leaseback transaction, number of stores not qualifying | store									14
Renewal term									5 years
Distribution centers
Sale Leaseback Transaction [Line Items]
Number of distribution centers sold | distribution_center								7
Minimum
Sale Leaseback Transaction [Line Items]
Annual rental payment increase period one									1 year
Annual rent increases			1.50%					1.50%
Maximum
Sale Leaseback Transaction [Line Items]
Annual rental payment increase period one									5 years
Annual rent increases			1.75%					1.75%