Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 01, 2014		Feb. 23, 2013		Mar. 01, 2014		Feb. 23, 2013
Revenues	$ 343,967		$ 334,306		$ 690,671		$ 666,875
Operating expenses:
Cost of revenues (1)	215,560	[1]	208,421	[1]	423,697	[1]	409,972	[1]
Selling and administrative expenses (1)	69,853	[1]	65,817	[1]	135,482	[1]	130,105	[1]
Depreciation and amortization	17,830		17,179		35,128		33,950
Total operating expenses	303,243		291,417		594,307		574,027
Income from operations	40,724		42,889		96,364		92,848
Other (income) expense:
Interest expense	216		400		424		860
Interest income	(877)		(924)		(1,642)		(1,691)
Exchange rate loss	161		198		2		38
Total other (income) expense	(500)		(326)		(1,216)		(793)
Income before income taxes	41,224		43,215		97,580		93,641
Provision for income taxes	15,577		16,573		37,471		36,239
Net income	25,647		26,642		60,109		57,402
Income per share – Diluted:
Common Stock (in Dollars per share)	$ 1.27		$ 1.33		$ 2.98		$ 2.86
Income allocated to – Basic:
Income per share – Diluted	25,647		26,642		60,109		57,402
Income allocated to – Diluted:
Common Stock	25,326		26,196		59,357		56,440
Weighted average number of shares outstanding – Diluted:
Common Stock (in Shares)	19,924		19,747		19,897		19,714
Common Class A [Member]
Income per share – Basic:
Income per share – Basic (in Dollars per share)	$ 1.34		$ 1.40		$ 3.15		$ 3.02
Income per share – Diluted:
Common Stock (in Dollars per share)	$ 1.27		$ 1.33		$ 2.98		$ 2.86
Income allocated to – Basic:
Income per share – Diluted	20,267		20,963		47,479		45,155
Income allocated to – Diluted:
Common Stock	25,326		26,196		59,357		56,440
Weighted average number of shares outstanding – Basic:
Income allocated to – Basic (in Shares)	15,077		14,962		15,053		14,943
Weighted average number of shares outstanding – Diluted:
Common Stock (in Shares)	19,924		19,747		19,897		19,714
Dividends per share:
Income allocated to – Diluted (in Dollars per share)	$ 0.0375		$ 0.0375		$ 0.0750		$ 0.0750
Common Class B [Member]
Income per share – Basic:
Income per share – Basic (in Dollars per share)	$ 1.08		$ 1.12		$ 2.52		$ 2.42
Income allocated to – Basic:
Income per share – Diluted	$ 5,041		$ 5,209		$ 11,836		$ 11,233
Weighted average number of shares outstanding – Basic:
Income allocated to – Basic (in Shares)	4,687		4,647		4,690		4,647
Dividends per share:
Income allocated to – Diluted (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.