Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Nov. 26, 2011		Nov. 27, 2010
Consolidated Statements of Income [Abstract]
Revenues	$ 313,025		$ 273,090
Operating expenses:
Cost of revenues	195,139	[1]	163,235	[1]
Selling and administrative expenses	59,124	[1]	55,183	[1]
Depreciation and amortization	16,408		15,502
Total operating expenses	270,671		233,920
Income from operations	42,354		39,170
Other expense (income):
Interest expense	573		2,203
Interest income	(631)		(582)
Foreign exchange loss (gain)	627		(172)
Total other expense	569		1,449
Income before income taxes	41,785		37,721
Provision for income taxes	15,983		13,957
Net income	25,802		23,764
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	19,877		19,828
Common Class A [Member]
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.37		$ 1.26
Income per share - Diluted:
Common Stock (in dollars per share)	$ 1.30		$ 1.20
Income allocated to - Basic:
Common Stock	20,258		18,604
Income allocated to - Diluted:
Common Stock	25,350		23,330
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	14,838		14,753
Weighted average number of shares outstanding - Diluted:
Common Stock (in shares)	19,557		19,487
Dividends per share:
Common Stock (in dollars per share)	$ 0.0375		$ 0.0375
Common Class B [Member]
Other expense (income):
Net income	5,068		4,704
Income per share - Basic:
Common Stock (in dollars per share)	$ 1.09		$ 1.01
Income allocated to - Basic:
Common Stock	$ 5,068		$ 4,704
Weighted average number of shares outstanding - Basic:
Common Stock (in shares)	4,641		4,663
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.