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Redeemable Noncontrolling Interest (Details) (USD $)
6 Months Ended 1 Months Ended 0 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Mar. 31, 2011
Common Stock [Member]
Subsidiaries [Member]
Feb. 28, 2013
Common Stock [Member]
Subsidiaries [Member]
Mar. 08, 2013
Subsequent Event [Member]
Redeemable Noncontrolling Interest [Line Items]          
Business Acquisition, Effective Date of Acquisition Mar. 31, 2011        
Business Acquisition Equity Interests Issued Or Issuable Percent Of Shares Issued     20.00%    
Period In Which Noncontrolling Interest Becomes Redeemable 60 days        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       19.00%  
Subsequent Event, Date Mar. 08, 2013        
Payments for Repurchase of Redeemable Noncontrolling Interest         $ 25,000,000
Redeemable Noncontrolling Interest, Equity, Fair Value 25,000,000        
Increase (Decrease) in Temporary Equity [Roll Forward]          
Balances - September 1 (Beginning of period) 22,248,000 19,053,000      
Net loss attributable to noncontrolling interest (903,000) (198,000)      
Currency translation adjustment (1,059,000) 217,000      
Capital contributions from noncontrolling interest holder 1,970,000 2,104,000      
Temporary Equity, Accretion to Redemption Value 2,504,000 0      
Balances - February 28, 2013 and February 29, 2012 (End of period) $ 24,760,000 $ 21,176,000