Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Feb. 28, 2015		Mar. 01, 2014		Feb. 28, 2015		Mar. 01, 2014
Revenues	$ 361,462		$ 343,967		$ 731,823		$ 690,671
Operating expenses:
Cost of revenues (1)	223,874	[1]	215,560	[1]	443,227	[1]	423,697	[1]
Selling and administrative expenses (1)	77,245	[1]	69,853	[1]	149,627	[1]	135,482	[1]
Depreciation and amortization	18,792		17,830		36,829		35,128
Total operating expenses	319,911		303,243		629,683		594,307
Income from operations	41,551		40,724		102,140		96,364
Other (income) expense:
Interest expense	239		216		427		424
Interest income	(944)		(877)		(1,748)		(1,642)
Foreign exchange loss	880		161		1,251		2
Total other (income) expense	175		(500)		(70)		(1,216)
Income before income taxes	41,376		41,224		102,210		97,580
Provision for income taxes	15,930		15,577		39,351		37,471
Net income	25,446		25,647		62,859		60,109
Income per share – Diluted:
Common Stock (in Dollars per share)	$ 1.26		$ 1.27		$ 3.11		$ 2.98
Income allocated to – Basic:
Income per share – Diluted	25,446		25,647		62,859		60,109
Income allocated to – Diluted:
Common Stock	25,235		25,326		62,335		59,357
Weighted average number of shares outstanding – Diluted:
Common Stock (in Shares)	20,065		19,924		20,028		19,897
Common Class A [Member]
Income per share – Basic:
Common Stock (in Dollars per share)	$ 1.33		$ 1.34		$ 3.29		$ 3.15
Income per share – Diluted:
Common Stock (in Dollars per share)	$ 1.26		$ 1.27		$ 3.11		$ 2.98
Income allocated to – Basic:
Income per share – Diluted	20,182		20,267		49,834		47,479
Income allocated to – Diluted:
Common Stock	25,235		25,326		62,335		59,357
Weighted average number of shares outstanding – Basic:
Income allocated to – Basic (in Shares)	15,185		15,077		15,156		15,053
Weighted average number of shares outstanding – Diluted:
Common Stock (in Shares)	20,065		19,924		20,028		19,897
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:
Common Stock (in Dollars per share)	$ 1.06		$ 1.08		$ 2.63		$ 2.52
Income allocated to – Basic:
Income per share – Diluted	$ 5,041		$ 5,041		$ 12,472		$ 11,836
Weighted average number of shares outstanding – Basic:
Income allocated to – Basic (in Shares)	4,741		4,687		4,741		4,690
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.