Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 25, 2012		Aug. 27, 2011		Aug. 28, 2010
Consolidated Statements of Income [Abstract]
Revenues	$ 1,256,289		$ 1,134,126		$ 1,025,939
Operating expenses:
Cost of revenues (1)	797,944	[1]	712,309	[1]	620,727	[1]
Selling and administrative expenses (1)	240,798	[1]	233,111	[1]	213,463	[1]
Depreciation and amortization	66,439		64,733		61,477
Total operating expenses	1,105,181		1,010,153		895,667
Income from operations	151,108		123,973		130,272
Other expense (income):
Interest expense	2,132		6,738		8,778
Interest income	(2,738)		(2,552)		(2,104)
Foreign exchange (gain) loss	980		(785)		746
Total other expense	374		3,401		7,420
Income before income taxes	150,734		120,572		122,852
Provision for income taxes	55,745		44,086		46,444
Net income	94,989		76,486		76,408
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	19,916		19,854		19,564
Common Class A [Member]
Other expense (income):
Net income	74,643		59,944		59,921
Income per share - Basic:
Common Stock (in dollars per share)	$ 5.02		$ 4.05		$ 4.11
Income per share - Diluted:
Common Stock (in dollars per share)	$ 4.76		$ 3.85		$ 3.90
Income allocated to - Basic:
Common Stock	74,643		59,944		59,921
Income allocated to - Diluted:
Common Stock	93,358		75,118		75,827
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	14,882		14,791		14,570
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,616		19,532		19,458
Dividends per share:
Common Stock (in dollars per share)	$ 0.15		$ 0.15		$ 0.15
Common Class B [Member]
Other expense (income):
Net income	18,630		15,104		15,875
Income per share - Basic:
Common Stock (in dollars per share)	$ 4.01		$ 3.24		$ 3.29
Income allocated to - Basic:
Common Stock	$ 18,630		$ 15,104		$ 15,875
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	4,643		4,658		4,823
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.