Asset Sale to WBA - Operating results of discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Nov. 30, 2019	Dec. 01, 2018
Costs and expenses:
Net (loss) income from discontinued operations, net of tax	$ (801)	$ 12,740	$ (1,695)	$ 262,091
Discontinued Operations, Disposed of by Sale [Member] | Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member]
Income statement disclosures
Revenues	(13)	6,727	(136)	34,843
Costs and expenses:
Cost of revenues	374	126	838	17,389
Selling, general and administrative expenses	306	3,855	1,170	20,300
Loss on debt retirements, net				22,645
Interest expense				4,615
Loss (gain) on stores sold to Walgreens Boots Alliance		(14,077)		(374,619)
Loss (gain) on sale of assets, net	89	3	(433)	14
Net expenses and non-operating income	769	(10,093)	1,575	(309,656)
(Loss) income from discontinued operations before income taxes	(782)	16,820	(1,711)	344,499
Income tax (benefit) expense	19	4,080	(16)	82,408
Net (loss) income from discontinued operations, net of tax	$ (801)	$ 12,740	$ (1,695)	$ 262,091