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Acquisitions (Narrative) (Details) (USD $)
0 Months Ended3 Months Ended
Apr. 15, 2011
Sep. 30, 2011
years
Sep. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Acquisitions     
Percentage of company equity acquired100.00%    
Name of company acquisitionCDC    
Initial payment for cash share purchase$ 36,228,000    
Liability for contingent consideration, current and non-current 21,253,000 23,794,000 
Liability for contingent consideration, current 2,140,000 2,398,000 
Liability for contingent consideration, non-current 19,113,000 21,396,000 
Undiscounted contingent consideration payments, minimum 2,100,000   
Undiscounted contingent consideration payments, maximum 52,100,000   
Change in fair value of the contingent consideration recognized in the Consolidated Financial Statements 894,000   
Estimated indemnification contingent liabilities 14,100,000   
Cash paid to escrow 27,400,000   
Undiscounted range of indemnification assets and contingent liabilities, minimum 5,100,000   
Undiscounted range of indemnification assets and contingent liabilities, maximum $ 22,900,000   
Weighted average amortization period, in years 6