Note 12 - Summary of Share-Based Activity (Details)	12 Months Ended
	Aug. 27, 2016 $ / shares shares
Outstanding, shares (in shares) | shares	645,001
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 73.72
Granted, shares (in shares) | shares	95,875
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 104.55
Exercised, shares (in shares) | shares	(111,935)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 46.35
Forfeited, shares (in shares) | shares	(18,250)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 87.35
Outstanding, shares (in shares) | shares	610,691
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 83.17
Exercisable, shares (in shares) | shares	125,441
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 64.67