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DESCRIPTION OF BUSINESS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements or Change in Accounting Principle (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 23, 2019	Feb. 24, 2018	Feb. 25, 2017	Jun. 16, 2018	Feb. 27, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling and administrative expenses	$ 16,107.3	$ 16,275.4	$ 16,032.9
Other income	(104.4)	(9.2)	(44.3)
Net cash used in investing activities	(86.8)	(469.0)	(1,079.6)
Net increase (decrease) in cash and cash equivalents and restricted cash	286.9	(548.3)	636.1
Cash and cash equivalents	926.1	670.3	1,219.2
Restricted cash	41.6	10.5	9.9
Cash and cash equivalents and restricted cash	$ 967.7	680.8	1,229.1		$ 593.0
ASU 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling and administrative expenses		51.7	32.9
Other income		51.7	32.9
ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used in investing activities		(0.6)	3.4
Net increase (decrease) in cash and cash equivalents and restricted cash		$ 0.6	$ (3.4)
(Accumulated deficit) / Retained earnings \| ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit				$ 5.8