Income Taxes (Details) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Mar. 02, 2019	Dec. 01, 2018	Sep. 01, 2018	Jun. 02, 2018	Feb. 29, 2020	Mar. 02, 2019	Dec. 31, 2018	Mar. 03, 2018
Income Taxes
Federal statutory rate (as a percent)	35.00%	35.00%									21.00%	21.00%	21.00%	32.60%
Current tax:
Federal											$ (6,758)	$ (22,187)		$ (210)
State											13,725	9,866		51,279
Total current tax expense (benefit)											6,967	(12,321)		51,069
Deferred tax and other:
Federal											345,469	50,151		316,451
State											35,171	39,647		(61,533)
Total deferred tax expense (benefit)											380,640	89,798		254,918
Total income tax expense (benefit)			$ 351,729	$ 876	$ 27,628	$ 7,374	$ 195,004	$ (1,471)	$ (106,559)	$ (9,497)	$ 387,607	$ 77,477		$ 305,987