Asset Sale to WBA - Operating results of discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 01, 2018	Dec. 02, 2017	Dec. 01, 2018	Dec. 02, 2017
Income statement disclosures
Revenues	$ 6,727	$ 2,386,710	$ 34,843	$ 7,130,653
Costs and expenses:
Cost of revenues	126	1,752,664	17,389	5,274,187
Selling, general and administrative expenses	3,855	572,810	20,300	1,765,620
Lease termination and impairment charges		11		74
Loss on debt retirements, net			22,645
Interest expense		59,456	4,615	178,797
Gain on assets sold to Walgreens Boots Alliance	(14,077)	(157,010)	(374,619)	(157,010)
Loss (gain) on sale of assets, net	3	(589)	14	23
Cost and expenses	(10,093)	2,227,342	(309,656)	7,061,691
Income from discontinued operations before income taxes	16,820	159,368	344,499	68,962
Income tax expense	4,080	60,155	82,408	26,705
Net income from discontinued operations, net of tax	$ 12,740	$ 99,213	$ 262,091	$ 42,257