Note 4 - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Mar. 26, 2016	Mar. 28, 2015
Net Earnings available to common stockholders	$ 15,588	$ 14,637	$ 28,566	$ 25,893
Weighted average number of shares outstanding, basic (in shares)	18,637	18,689	18,662	18,679
Earnings per share, basic (in dollars per share)	$ 0.84	$ 0.78	$ 1.53	$ 1.39
Options
Options (in shares)	115	132	134	132
Options (in dollars per share)	$ (0.01)		$ (0.01)	$ (0.01)
Net Earnings available to common stockholders plus assumed conversions	$ 15,588	$ 14,637	$ 28,566	$ 25,893
Weighted average number of shares outstanding, diluted (in shares)	18,752	18,821	18,796	18,811
Earnings per diluted share (in dollars per share)	$ 0.83	$ 0.78	$ 1.52	$ 1.38