Consolidated Statements of Comprehensive Earnings (Loss) - USD ($)	12 Months Ended
	Feb. 28, 2016	Mar. 01, 2015	Mar. 02, 2014
Gains on Marketable Securities [Member]
Unrealized gains on marketable securities:
Unrealized holding gains (losses) arising during the period	$ 52,000	$ 90,000	$ 117,000
Less: reclassification adjustment for gains (losses) included in net earnings	(18,000)	(21,000)	(20,000)
Losses on Marketable Securities [Member]
Unrealized gains on marketable securities:
Unrealized holding gains (losses) arising during the period	(156,000)	(20,000)	(83,000)
Less: reclassification adjustment for gains (losses) included in net earnings	63,000	13,000	158,000
Net earnings (loss)	18,029,000	20,043,000	(42,329,000)
Foreign currency translation	62,000	185,000	420,000
Other comprehensive earnings	(3,000)	(247,000)	(592,000)
Total comprehensive earnings (loss)	$ 18,032,000	$ 20,290,000	$ (41,737,000)