BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) shares in Millions, $ in Millions		4 Months Ended
	May 12, 2021 shares	Jun. 19, 2021 USD ($) division store_format segment shares	Jun. 20, 2020 USD ($)	Feb. 27, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash | $		$ 50.6		$ 50.6
LIFO expense | $		14.5	$ 13.1
Income tax expense | $		$ 132.5	$ 201.9
Effective tax rate		23.00%	25.60%
Number of divisions | division		12
Number of reportable segments | segment		1
Number of store format | store_format		1
Receivables, net | $		$ 618.7		550.9
Contract liability related to gift cards | $		85.0		98.1
Pharmacy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net | $		298.9		$ 262.5
Phantom Units
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Grants in period (in shares) | shares	1.7
Compensation cost not yet recognized | $		$ 119.4
Number of unvested phantom units (in shares) | shares		11.1
Period for recognition of unrecognized compensation cost		1 year 10 months 24 days
Phantom Units | President and Chief Executive Officer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vesting percentage		50.00%
Restricted Stock Units (RSU) Deemed not Granted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Issued in period (in shares) | shares	2.2
Restricted Stock Units (RSU) Deemed not Granted | President and Chief Executive Officer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Award vesting period		3 years
Direct Equity Interest | President and Chief Executive Officer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Award vesting period		5 years
RSUs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Issued in period (in shares) | shares	3.2
Compensation cost not yet recognized | $		$ 9.2
Number of unvested phantom units (in shares) | shares		1.0
Period for recognition of unrecognized compensation cost		1 year 10 months 24 days
Restricted Stock Units (RSU), Performance Based, Deemed Not Granted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Grants in period (in shares) | shares	0.5
Performance Based Restricted Stock Units
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Issued in period (in shares) | shares	1.2
Performance Based Restricted Stock Awards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Issued in period (in shares) | shares	0.3