Asset Sale to WBA - Operating results of discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Mar. 02, 2019	Dec. 01, 2018	Sep. 01, 2018	Jun. 02, 2018	Feb. 29, 2020	Mar. 02, 2019	Mar. 03, 2018
Costs and expenses:
Income tax expense									$ 7,011	$ 91,067	$ 749,704
Net income from discontinued operations, net of tax	$ 18,740	$ (801)	$ (574)	$ (320)	$ (17,350)	$ 12,740	$ (6,792)	$ 256,143	17,045	244,741	1,293,002
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member]
Income statement disclosures
Revenues									(21)	34,889	8,686,397
Costs and expenses:
Cost of revenues										24,271	6,406,067
Net credit to cost of revenues									(5,639)
Selling, general and administrative expenses									1,498	20,681	2,134,276
Lease termination and impairment charges											77
Loss on debt retirements, net										22,646	8,180
Interest expense									1	4,616	224,300
Gain on stores sold to Walgreens Boots Alliance										(374,619)	(2,128,832)
Gain on sale of assets, net									(19,937)	1,486	(377)
Net expenses and non-operating income									(24,077)	(300,919)	6,643,691
Income from discontinued operations before income taxes									24,056	335,808	2,042,706
Income tax expense									7,011	91,067	749,704
Net income from discontinued operations, net of tax									$ 17,045	$ 244,741	$ 1,293,002