Goodwill and Intangible Assets (Details 2) (USD $)	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Aug. 31, 2012
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	$ 124,818,000		$ 109,572,000
Finite-Lived Intangible Assets, Accumulated Amortization	(22,313,000)		(19,534,000)
Finite-Lived Intangible Assets, Net	102,505,000		90,038,000
Amortization of Intangible Assets	2,600,000	1,900,000
Customer Related Intangibles [Member]
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	88,846,000		74,039,000
Finite-Lived Intangible Assets, Accumulated Amortization	(15,161,000)		(13,263,000)
Finite-Lived Intangible Assets, Net	73,685,000		60,776,000
Developed Technology [Member]
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	19,445,000		19,189,000
Finite-Lived Intangible Assets, Accumulated Amortization	(3,718,000)		(3,258,000)
Finite-Lived Intangible Assets, Net	15,727,000		15,931,000
Trademarks and Tradenames [Member]
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	16,527,000		16,344,000
Finite-Lived Intangible Assets, Accumulated Amortization	(3,434,000)		(3,013,000)
Finite-Lived Intangible Assets, Net	$ 13,093,000		$ 13,331,000