Note 15 - Summary of Quarterly Results (Unaudited) - Summary of Quarterly Results (Details) - USD ($) $ / shares in Units, $ 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
Net sales	$ 2,742,141		$ 2,936,357		$ 2,954,539		$ 3,716,264		$ 3,533,954		$ 2,955,484		$ 2,988,235		$ 2,738,084		$ 12,349,301	$ 12,215,757	$ 12,103,887
Gross profit	1,000,115		1,068,559		1,041,061		1,333,280		1,343,091		1,092,774		1,116,893		1,023,592		4,443,015	4,576,350	4,620,310
Operating profit	147,011		168,847		108,360		337,103		429,928		211,283		280,973		213,026		761,321	1,135,210	1,414,903
Earnings before provision for income taxes	130,431		149,681		94,739		320,809		413,141		193,029		262,774		196,711		695,660	1,065,655	1,327,445
Provision for income taxes	55,148		55,451		33,438		126,765		144,411		66,605		95,439		74,092		270,802	380,547	485,956
Net earnings	$ 75,283		$ 94,230		$ 61,301		$ 194,044		$ 268,730		$ 126,424		$ 167,335		$ 122,619		$ 424,858	$ 685,108	$ 841,489
EPS-Basic (in dollars per share)	$ 0.53	[1]	$ 0.67	[1]	$ 0.44	[1]	$ 1.41	[1]	$ 1.86	[1]	$ 0.86	[1]	$ 1.12	[1]	$ 0.81	[1]	$ 3.05	$ 4.61	$ 5.15
EPS-Diluted (in dollars per share)	0.53	[1]	0.67	[1]	0.44	[1]	1.41	[1]	1.84	[1]	0.85	[1]	1.11	[1]	0.80	[1]	3.04	4.58	5.10
Dividends declared per share (in dollars per share)	$ 0.15		$ 0.15		$ 0.15		$ 0.15		$ 0.125		$ 0.125		$ 0.125		$ 0.125		$ 0.60	$ 0.50

[1] Net earnings per share ("EPS") amounts for each quarter are required to be computed independently and may not equal the amount computed for the total year.