Note 5 - Fair Value Measurements (Details) - Changes in Company’s Financial Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Auction Rate Securities [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 01, 2014
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance on March 2, 2013, net of temporary valuation adjustment	$ 49.0
Change in temporary valuation adjustment included in accumulated other comprehensive loss	(1.3)
Balance on March 1, 2014, net of temporary valuation adjustment	$ 47.7