Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	May 26, 2012		May 28, 2011		May 26, 2012		May 28, 2011
Consolidated Statements of Income [Abstract]
Revenues	$ 320,931		$ 291,567		$ 943,915		$ 843,252
Operating expenses:
Cost of revenues (1)	202,433	[1]	185,217	[1]	599,009	[1]	524,685	[1]
Selling and administrative expenses (1)	59,108	[1]	60,852	[1]	179,429	[1]	174,649	[1]
Depreciation and amortization	16,718		16,365		49,615		47,942
Total operating expenses	278,259		262,434		828,053		747,276
Income from operations	42,672		29,133		115,862		95,976
Other (income) expense:
Interest expense	511		1,586		1,639		5,991
Interest income	(656)		(616)		(2,036)		(1,852)
Exchange rate loss (gain)	457		(291)		1,028		(682)
Total other expense	312		679		631		3,457
Income before income taxes	42,360		28,454		115,231		92,519
Provision for income taxes	14,901		10,023		42,774		34,047
Net income	27,459		18,431		72,457		58,472
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	19,936		19,867		19,907		19,847
Common Class A [Member]
Other (income) expense:
Net income	21,587		14,453		56,926		45,810
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.45		$ 0.98		$ 3.83		$ 3.10
Income per share - Diluted:
Common Stock (in dollars per share)	$ 1.37		$ 0.93		$ 3.63		$ 2.94
Income allocated to - Basic:
Common Stock	21,587		14,453		56,926		45,810
Income allocated to - Diluted:
Common Stock	26,993		18,105		71,205		57,420
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	14,905		14,810		14,872		14,780
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,646		19,549		19,600		19,522
Dividends per share:
Common Stock (in dollars per share)	$ 0.0375		$ 0.0375		$ 0.1125		$ 0.1125
Common Class B [Member]
Other (income) expense:
Net income	5,381		3,635		14,214		11,555
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.16		$ 0.78		$ 3.06		$ 2.48
Income allocated to - Basic:
Common Stock	$ 5,381		$ 3,635		$ 14,214		$ 11,555
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	4,644		4,656		4,642		4,660
Dividends per share:
Common Stock (in dollars per share)	$ 0.0300		$ 0.0300		$ 0.0900		$ 0.0900

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