Note 8 - Provision for Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 03, 2018	Nov. 25, 2017	Aug. 26, 2017	May 27, 2017	Feb. 25, 2017	Nov. 26, 2016	Aug. 27, 2016	May 28, 2016	Mar. 03, 2018	Feb. 25, 2017	Feb. 27, 2016
Current:
Federal									$ 82,044	$ 313,571	$ 389,039
State and local									13,554	42,101	39,991
Total Current									95,598	355,672	429,030
Deferred:
Federal									157,057	20,295	42,592
State and local									18,147	4,580	14,334
Total Deferred									175,204	24,875	56,926
Total	$ 55,148	$ 55,451	$ 33,438	$ 126,765	$ 144,411	$ 66,605	$ 95,439	$ 74,092	$ 270,802	$ 380,547	$ 485,956