Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Feb. 26, 2017	20,965,144				730,473
Balance at Feb. 26, 2017	$ 2,096	$ 167,612	$ 27,112	$ 1,026	$ (15,020)
Net earnings			20,595			$ 20,595
Foreign currency translation				(50)
Unrealized loss on marketable securities, net of tax				(845)
Stock options exercised (in shares)					(6,900)	6,900
Stock options exercised		(46)			$ 142
Stock-based compensation		1,445
Cash dividends ($3.40 per share)			(68,806)
Balance (in shares) at Feb. 25, 2018	20,965,144				723,573
Balance at Feb. 25, 2018	$ 2,096	169,011	(21,099)	131	$ (14,878)
Net earnings			113,545			$ 113,545
Foreign currency translation				(1,310)
Unrealized loss on marketable securities, net of tax				1,157
Stock options exercised (in shares)					(244,382)	244,382
Stock options exercised		(1,157)			$ 5,025
Stock-based compensation		1,541
Cash dividends ($3.40 per share)			(95,051)
Balance (in shares) at Mar. 03, 2019	20,965,144				479,191
Balance at Mar. 03, 2019	$ 2,096	169,395	(2,605)	(22)	$ (9,853)	$ 159,011
Net earnings			9,552			$ 9,552
Unrealized loss on marketable securities, net of tax				690
Stock options exercised (in shares)					(32,870)	32,873
Stock options exercised		(259)			$ 676
Stock-based compensation		726
Cash dividends ($3.40 per share)			(28,721)
Balance (in shares) at Mar. 01, 2020	20,965,144				446,321
Balance at Mar. 01, 2020	$ 2,096	$ 169,862	$ (21,774)	$ 668	$ (9,177)	$ 141,675