Note 10 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended		9 Months Ended		155 Months Ended
	Dec. 20, 2017	Nov. 25, 2017	Nov. 26, 2016	Nov. 25, 2017	Nov. 26, 2016	Nov. 25, 2017	Sep. 30, 2015
Stock Repurchase Program, Authorized Amount							$ 11,950,000
Treasury Stock, Shares, Acquired				6.0		199.3
Payments for Repurchase of Common Stock				$ 207,277	$ 375,541	$ 10,400,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 1,500,000		$ 1,500,000		$ 1,500,000
Common Stock, Dividends, Per Share, Declared		$ 0.15	$ 0.125	$ 0.45	$ 0.375
Common Stock, Dividends, Per Share, Cash Paid				$ 0.30	$ 0.25
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.15