Note 3 - Marketable Securities (Details) - Summary Of Available-For-Sale Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 03, 2013	Sep. 01, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 89,152	$ 174,305
Gross Unrealized Gains	19	27
Gross Unrealized Losses	72	143
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	48,293	144,353
Gross Unrealized Gains	7	27
Gross Unrealized Losses	9	86
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	40,859	29,952
Gross Unrealized Gains	12	0
Gross Unrealized Losses	$ 63	$ 57