Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
May 30, 2020	Jun. 01, 2019	Feb. 29, 2020
Income Taxes
Income tax (benefit) expense	$ (8,018)	$ 7,374
Estimated effective tax rate (as a percent)	9.90%	8.00%
Increase in valuation allowance to offset the current year deferred state tax benefits (as a percent)	(10.60%)	(34.50%)
Decrease in unrecognized tax benefits related to state exposures	$ 13,210
Valuation allowance against net deferred tax assets	$ 1,681,399		$ 1,673,119

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

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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