Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Nov. 24, 2012		Nov. 26, 2011
Consolidated Statements of Income [Abstract]
Revenues	$ 332,569		$ 313,025
Operating expenses:
Cost of revenues (1)	201,551	[1]	195,139	[1]
Selling and administrative expenses (1)	64,288	[1]	59,124	[1]
Depreciation and amortization	16,771		16,408
Total operating expenses	282,610		270,671
Income from operations	49,959		42,354
Other (income) expense:
Interest expense	460		573
Interest income	(767)		(631)
Foreign exchange (gain) loss	(160)		627
Total other (income) expense	(467)		569
Income before income taxes	50,426		41,785
Provision for income taxes	19,666		15,983
Net income	30,760		25,802
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	19,955		19,877
Common Class A [Member]
Other (income) expense:
Net income	24,191		20,258
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.62		$ 1.37
Income per share - Diluted:
Common Stock (in dollars per share)	$ 1.54		$ 1.30
Income allocated to - Basic:
Common Stock	24,191		20,258
Income allocated to - Diluted:
Common Stock	30,244		25,350
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	14,925		14,838
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,693		19,557
Dividends per share:
Common Stock (in dollars per share)	$ 0.0375		$ 0.0375
Common Class B [Member]
Other (income) expense:
Net income	6,025		5,068
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.30		$ 1.09
Income allocated to - Basic:
Common Stock	$ 6,025		$ 5,068
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	4,647		4,641
Dividends per share:
Common Stock (in dollars per share)	$ 0.0300		$ 0.0300

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