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Goodwill and Other Intangible Assets, net (Details) (USD $)
12 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Goodwill [Line Items]  
Goodwill, Impaired, Accumulated Impairment Loss$ 0 
Goodwill [Roll Forward]  
Goodwill, beginning of period380,332,000366,559,000
Acquisitions243,924,00027,018,000
Divestitures (12,030,000)
Purchase accounting adjustments1,035,000(1,666,000)
Foreign currency translation adjustment2,514,000451,000
Goodwill, end of period627,805,000380,332,000
MRB [Member]
  
Goodwill [Roll Forward]  
Goodwill, beginning of period230,198,000228,977,000
Acquisitions232,341,0003,091,000
Divestitures 0
Purchase accounting adjustments1,086,000(1,870,000)
Foreign currency translation adjustment1,021,0000
Goodwill, end of period464,646,000230,198,000
APB [Member]
  
Goodwill [Roll Forward]  
Goodwill, beginning of period150,134,000137,582,000
Acquisitions11,583,00023,927,000
Divestitures (12,030,000)
Purchase accounting adjustments(51,000)204,000
Foreign currency translation adjustment1,493,000451,000
Goodwill, end of period$ 163,159,000$ 150,134,000