Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Dec. 01, 2018	Sep. 01, 2018
Accounts receivable, allowance for doubtful accounts	$ 14,964	$ 12,992
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, at cost, shares	9,234,703	9,207,635
Class A Common Stock [Member]
Common stock, votes per share	1
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	54,381,687	54,649,158
Class B Common Stock [Member]
Common stock, votes per share	10
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	10,193,348	10,454,765
Common stock, shares outstanding	10,193,348	10,454,765