Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Aug. 31, 2019	Sep. 01, 2018	Aug. 31, 2019	Sep. 01, 2018	Mar. 02, 2019
Income Taxes
Income tax expense (benefit)	$ 27,628	$ (106,559)	$ 35,002	$ (116,056)
Estimated effective tax rate (as a percent)	(54.10%)	23.20%	(24.50%)	22.80%
Increase in valuation allowance to offset the current year deferred state tax benefits (as a percent)	(78.40%)	(4.20%)	(50.20%)	(3.90%)
Decrease in unrecognized tax benefits related to state exposures	$ 7,372		$ 7,372
Valuation allowance against net deferred tax assets	$ 1,088,033		$ 1,088,033		$ 1,091,416

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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