Revenue, Receivables and Contract Assets and Liabilities Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Aug. 28, 2021	Feb. 27, 2021	Feb. 29, 2020
Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Loss	$ 2,103	$ 1,947	$ 2,469
Additions charged to costs and expenses	239	389
Deductions from allowance, net of recoveries	(75)	(887)
Other changes (1)	$ (8)	$ (24)