Goodwill and Intangible Assets (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013	Aug. 31, 2013
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	$ 155,093,000		$ 155,093,000		$ 120,761,000
Finite-Lived Intangible Assets, Accumulated Amortization	(35,554,000)		(35,554,000)		(28,874,000)
Finite-Lived Intangible Assets, Net	119,539,000		119,539,000		91,887,000
Amortization of Intangible Assets	3,100,000	2,600,000	6,100,000	5,200,000
Customer Related Intangibles [Member]
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	107,961,000		107,961,000		85,129,000
Finite-Lived Intangible Assets, Accumulated Amortization	(23,922,000)		(23,922,000)		(19,605,000)
Finite-Lived Intangible Assets, Net	84,039,000		84,039,000		65,524,000
Developed Technology [Member]
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	20,052,000		20,052,000		19,641,000
Finite-Lived Intangible Assets, Accumulated Amortization	(6,147,000)		(6,147,000)		(5,156,000)
Finite-Lived Intangible Assets, Net	13,905,000		13,905,000		14,485,000
Trademarks and Tradenames [Member]
Acquired Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	27,080,000		27,080,000		15,991,000
Finite-Lived Intangible Assets, Accumulated Amortization	(5,485,000)		(5,485,000)		(4,113,000)
Finite-Lived Intangible Assets, Net	$ 21,595,000		$ 21,595,000		$ 11,878,000