Note 4 - Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 25, 2017	Nov. 26, 2016	Nov. 25, 2017	Nov. 26, 2016	Feb. 25, 2017
Income Tax Expense (Benefit)	$ 33,438	$ 66,605	$ 144,037	$ 236,136
Reclassification of Deferred Tax Assets From Other Current Assets to Other Assets [Member] | February 25, 2017 [Member]
Prior Period Reclassification Adjustment					$ 218,800
Reclassification of Deferred Tax Liabilities From Deferred Rent and Other Liabilities to Other Assets [Member] | February 25, 2017 [Member]
Prior Period Reclassification Adjustment					23,400
Reclassification of Deferred Tax Assets and Liabilities From Other Current and Deferred Rent and Other Liabilities to Other Assets [Member] | February 25, 2017 [Member]
Prior Period Reclassification Adjustment					$ 195,500
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)	$ 400		$ 9,400
Reclassification of Excess Tax Benefits from Financing to Operating Activities [Member] | Nine Months Ended November 26, 2016 [Member]
Prior Period Reclassification Adjustment				$ 1,500