Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Sep. 01, 2012
Accounts receivable, allowance for doubtful accounts	$ 7,523	$ 6,934
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A treasury stock, shares	5,340,587	5,342,091
Class A Common Stock [Member]
Common stock, voting rights	one vote per share	one vote per share
Common stock, number voting rights, per share	1	1
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	54,634,259	52,581,838
Class B Common Stock [Member]
Common stock, voting rights	ten votes per share	ten votes per share
Common stock, number voting rights, per share	10	10
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	14,140,747	15,560,294
Common stock, shares outstanding	14,140,747	15,560,294