Note 12 - Share-based Compensation (Details) - Summary of share based activity (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2013
Summary of share based activity [Abstract]
Outstanding, August 25, 2012	560,270
Outstanding, August 25, 2012 (in Dollars per share)	$ 41.74
Granted	127,870
Granted (in Dollars per share)	$ 70.08
Exercised	(97,600)
Exercised (in Dollars per share)	$ 38.39
Forfeited	(6,000)
Forfeited (in Dollars per share)	$ 44.80
Outstanding, August 31, 2013	584,540
Outstanding, August 31, 2013 (in Dollars per share)	$ 48.47
Exercisable, August 31, 2013	100,340
Exercisable, August 31, 2013 (in Dollars per share)	$ 44.78