Consolidated Statements of Income (USD $) In Thousands, except Per Share data	12 Months Ended
	Aug. 27, 2011		Aug. 28, 2010		Aug. 29, 2009
Consolidated Statements of Income [Abstract]
Revenues	$ 1,134,126		$ 1,025,939		$ 1,013,416
Operating expenses:
Cost of revenues	712,309	[1]	620,727	[1]	609,629	[1]
Selling and administrative expenses	233,111	[1]	213,463	[1]	211,962	[1]
Depreciation and amortization	64,733		61,477		57,789
Total operating expenses	1,010,153		895,667		879,380
Income from operations	123,973		130,272		134,036
Other expense (income):
Interest expense	6,738		8,778		9,313
Interest income	(2,552)		(2,104)		(1,992)
Foreign exchange (gain) loss	(785)		746		250
Total other expense	3,401		7,420		7,571
Income before income taxes	120,572		122,852		126,465
Provision for income taxes	44,086		46,444		50,613
Net income	76,486		76,408		75,852
Income per share - Basic:
Common Stock (in dollars per share)	$ 4.05		$ 4.11		$ 4.14
Income per share - Diluted:
Common Stock (in dollars per share)	$ 3.85		$ 3.90		$ 3.92
Income allocated to - Diluted:
Common Stock	75,118		75,827		75,852
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	19,854		19,564		19,329
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,532		19,458		19,373
Common Class A [Member]
Income per share - Basic:
Common Stock (in dollars per share)	$ 4.05		$ 4.11		$ 4.14
Income per share - Diluted:
Common Stock (in dollars per share)	$ 3.85		$ 3.90		$ 3.92
Income allocated to - Basic:
Common Stock	59,944		59,921		59,526
Income allocated to - Diluted:
Common Stock	75,118		75,827		75,852
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	14,791		14,570		14,394
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,532		19,458		19,373
Dividends per share:
Common Stock (in dollars per share)	$ 0.15		$ 0.15		$ 0.15
Common Class B [Member]
Other expense (income):
Net income	15,104		15,875		16,326
Income per share - Basic:
Common Stock (in dollars per share)	$ 3.24		$ 3.29		$ 3.31
Income allocated to - Basic:
Common Stock	$ 15,104		$ 15,875		$ 16,326
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	4,658		4,823		4,935
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	4,658		4,823		4,935
Dividends per share:
Common Stock (in dollars per share)	$ 0.12		$ 0.12		$ 0.12

[1] Exclusive of depreciation on the Company's property, plant and equipment and amortization of its intangible assets.