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Redeemable Noncontrolling Interest (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Mar. 31, 2011
Common Stock [Member]
Subsidiaries [Member]
Nov. 30, 2012
Common Stock [Member]
Subsidiaries [Member]
Nov. 30, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Nov. 30, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Inputs, Level 3 [Member]
Nov. 30, 2012
Income Approach Valuation Technique [Member]
Redeemable Noncontrolling Interest [Line Items]              
Business Acquisition, Effective Date of Acquisition March 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%      
Redeemable Noncontrolling Interest, Equity, Fair Value         $ 24,000,000 $ 24,000,000  
Weighted average cost of capital             12.80%
Terminal growth rate of cash flows             2.00%
Increase (Decrease) in Temporary Equity [Roll Forward]              
Redeemable Noncontrolling Interest, beginning of period 22,248,000 19,053,000          
Net loss attributable to noncontrolling interest (442,000) (207,000)          
Currency Translation Adjustment (174,000) (377,000)          
Capital contributions from noncontrolling interest holder 1,970,000 467,000          
Redeemable Noncontrolling Interest, end of period $ 23,602,000 $ 18,936,000