Asset Sale to WBA - Operating results of discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended
	May 30, 2020	Jun. 01, 2019
Costs and expenses:
Net income from discontinued operations, net of tax	$ 9,161	$ (320)
Discontinued Operations, Disposed of by Sale [Member] | Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member]
Income statement disclosures
Revenues	174	(88)
Costs and expenses:
Cost of revenues	8	265
Selling, general and administrative expenses	871	486
Gain on sale of assets, net	(14,149)	(522)
Net expenses and non-operating income	(13,270)	229
Income from discontinued operations before income taxes	13,444	(317)
Income tax expense	4,283	3
Net income from discontinued operations, net of tax	$ 9,161	$ (320)