Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Feb. 25, 2012		Feb. 26, 2011		Feb. 25, 2012		Feb. 26, 2011
Consolidated Statements of Income [Abstract]
Revenues	$ 309,959		$ 278,595		$ 622,984		$ 551,685
Operating expenses:
Cost of revenues (1)	201,437	[1]	176,233	[1]	396,576	[1]	339,468	[1]
Selling and administrative expenses (1)	61,197	[1]	58,614	[1]	120,321	[1]	113,797	[1]
Depreciation and amortization	16,489		16,075		32,897		31,577
Total operating expenses	279,123		250,922		549,794		484,842
Income from operations	30,836		27,673		73,190		66,843
Other (income) expense:
Interest expense	555		2,202		1,128		4,405
Interest income	(749)		(654)		(1,380)		(1,236)
Exchange rate (gain) loss	(56)		(219)		571		(391)
Total other (income) expense	(250)		1,329		319		2,778
Income before income taxes	31,086		26,344		72,871		64,065
Provision for income taxes	11,890		10,067		27,873		24,024
Net income	19,196		16,277		44,998		40,041
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	19,907		19,847		19,892		19,838
Common Class A [Member]
Other (income) expense:
Net income	15,081		12,750		35,341		31,356
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.01		$ 0.86		$ 2.38		$ 2.12
Income per share - Diluted:
Common Stock (in dollars per share)	$ 0.96		$ 0.82		$ 2.26		$ 2.02
Income allocated to - Basic:
Common Stock	15,081		12,750		35,341		31,356
Income allocated to - Diluted:
Common Stock	18,863		15,983		44,213		39,314
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	14,873		14,778		14,856		14,766
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,605		19,528		19,575		19,503
Dividends per share:
Common Stock (in dollars per share)	$ 0.0375		$ 0.0375		$ 0.0750		$ 0.0750
Common Class B [Member]
Other (income) expense:
Net income	3,765		3,218		8,832		7,921
Income per share - Basic:
Common Stock (in dollars per share)	$ 0.81		$ 0.69		$ 1.90		$ 1.70
Income allocated to - Basic:
Common Stock	$ 3,765		$ 3,218		$ 8,832		$ 7,921
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	4,640		4,661		4,640		4,662
Dividends per share:
Common Stock (in dollars per share)	$ 0.0300		$ 0.0300		$ 0.0600		$ 0.0600

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