Asset Sale to WBA - Operating results of discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 02, 2019	Dec. 01, 2018	Sep. 01, 2018	Jun. 02, 2018	Mar. 03, 2018	Dec. 02, 2017	Sep. 02, 2017	Jun. 03, 2017	Mar. 02, 2019	Mar. 03, 2018	Mar. 04, 2017
Income statement disclosures
Revenues									$ 34,889	$ 8,686,397	$ 10,050,049
Costs and expenses:
Cost of revenues									24,271	6,406,067	7,340,691
Selling, general and administrative expenses									20,681	2,134,276	2,465,364
Lease termination and impairment charges										77	9,516
Loss on debt retirements, net									22,646	8,180
Interest expense									4,616	224,300	231,926
Gain on assets sold to Walgreens Boots Alliance									(374,619)	(2,128,832)
Loss (gain) on sale of assets, net									1,486	(377)	2,625
Cost and expenses									(300,919)	6,643,691	10,050,122
Income from discontinued operations before income taxes									335,808	2,042,706	(73)
Income tax expense									91,067	749,704	46
Net income from discontinued operations, net of tax	$ (17,350)	$ 12,740	$ (6,792)	$ 256,143	$ 1,250,745	$ 99,213	$ (17,644)	$ (39,312)	$ 244,741	$ 1,293,002	$ (27)