Goodwill and Other Intangible Assets, net (Details) (USD $)	3 Months Ended	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Goodwill [Line Items]
Goodwill impairment charge	$ 321,000,000	$ 321,000,000	$ 0	$ 0
Goodwill, Impaired, Accumulated Impairment Loss	321,000,000	321,000,000	0
Goodwill [Roll Forward]
Goodwill, beginning of period		635,491,000	627,805,000
Acquisitions		19,378,000	1,454,000
Purchase price adjustments			1,540,000
Purchase accounting adjustments		749,000	5,902,000
Foreign currency translation adjustment		(7,354,000)	(1,210,000)
Goodwill, impairment charges	(321,000,000)	(321,000,000)	0	0
Goodwill, end of period	327,264,000	327,264,000	635,491,000	627,805,000
MRB
Goodwill [Line Items]
Goodwill impairment charge		321,000,000
Goodwill [Roll Forward]
Goodwill, beginning of period		471,954,000	464,646,000
Acquisitions		1,744,000	1,454,000
Purchase price adjustments			1,540,000
Purchase accounting adjustments		135,000	5,361,000
Foreign currency translation adjustment		(5,620,000)	(1,047,000)
Goodwill, impairment charges		(321,000,000)
Goodwill, end of period	147,213,000	147,213,000	471,954,000
APB
Goodwill [Line Items]
Goodwill impairment charge		0
Goodwill [Roll Forward]
Goodwill, beginning of period		163,537,000	163,159,000
Acquisitions		17,634,000	0
Purchase price adjustments			0
Purchase accounting adjustments		614,000	541,000
Foreign currency translation adjustment		(1,734,000)	(163,000)
Goodwill, impairment charges		0
Goodwill, end of period	$ 180,051,000	$ 180,051,000	$ 163,537,000