Note 7 - Provision for Income Taxes (Details Textual) $ in Millions	12 Months Ended
	Feb. 25, 2017 USD ($)	Feb. 27, 2016 USD ($)	Feb. 28, 2015	Feb. 26, 2016 USD ($)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 76.3	$ 72.7
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	8.1	10.5
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 2.4	$ 2.5
Number of States in which Entity Operates	50
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	3.25%	3.07%	3.01%
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent	0.28%	0.07%	0.04%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	2.82%	1.53%	1.72%
Minimum [Member]
Income Tax Examination Number of Years Under Examination	3 years
Maximum [Member]
Income Tax Examination Number of Years Under Examination	5 years
Expiration Of Statutes Of Limitations [Member] | Minimum [Member]
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 3.0
Expiration Of Statutes Of Limitations [Member] | Maximum [Member]
Increase in Unrecognized Tax Benefits is Reasonably Possible	4.0
Other Tax Credit [Member]
Tax Credit Carryforward, Amount, Net of Tax	1.0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Net of Tax	9.6
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Net of Tax	4.5
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Enterprise Zone Credit [Member]
Tax Credit Carryforward, Amount, Net of Tax	3.1
Other Current Assets [Member]
Deferred Tax Assets, Net, Current	218.9			$ 201.5
Deferred Rent and Other Liabilities [Member]
Deferred Tax Liabilities, Net, Noncurrent	$ 23.4			$ 2.4