Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions	12 Months Ended
	Feb. 29, 2020	Feb. 23, 2019	Feb. 24, 2018
Income Statement [Abstract]
Net sales and other revenue	$ 62,455,100,000	$ 60,534,500,000	$ 59,924,600,000
Cost of sales	44,860,900,000	43,639,900,000	43,563,500,000
Gross profit	17,594,200,000	16,894,600,000	16,361,100,000
Selling and administrative expenses	16,641,900,000	16,272,300,000	16,208,700,000
(Gain) loss on property dispositions and impairment losses, net	(484,800,000)	(165,000,000.0)	66,700,000
Goodwill impairment	0	0	142,300,000
Operating income (loss)	1,437,100,000	787,300,000	(56,600,000)
Interest expense, net	698,000,000.0	830,800,000	874,800,000
Loss (gain) on debt extinguishment	111,400,000	8,700,000	(4,700,000)
Other expense (income), net	28,500,000	(104,400,000)	(9,200,000)
Income (loss) before income taxes	599,200,000	52,200,000	(917,500,000)
Income tax expense (benefit)	132,800,000	(78,900,000)	(963,800,000)
Net income	466,400,000	131,100,000	46,300,000
Other comprehensive income (loss), net of tax:
(Loss) gain on interest rate swaps	(3,400,000)	(15,500,000)
(Loss) gain on interest rate swaps			47,000,000.0
Recognition of pension (loss) gain	(210,500,000)	(83,100,000)	92,200,000
Foreign currency translation adjustment	300,000	(300,000)	65,000,000.0
Other	3,800,000	(900,000)	(300,000)
Other comprehensive (loss) income	(209,800,000)	(99,800,000)	203,900,000
Comprehensive income	$ 256,600,000	$ 31,300,000	$ 250,200,000
Net income per common share:
Basic net income per common share (in dollars per share)	$ 0.80	$ 0.23	$ 0.08
Diluted net income per common share (in dollars per share)	$ 0.80	$ 0.23	$ 0.08
Weighted average common shares outstanding:
Basic (in shares)	579.4	580.5	579.5
Diluted (in shares)	580.3	580.7	579.5