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Fair Value of Financial Instruments - (Fair Value Hierarchy for Company's Financial Assets and Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Liabilities:    
Debt $ 49,851 $ 29,591
Money Market Funds [Member]
   
Assets:    
Fair value 118,306 108,228
Fair Value, Inputs, Level 1 [Member]
   
Liabilities:    
Debt      
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
   
Assets:    
Fair value 118,306 108,228
Fair Value, Inputs, Level 2 [Member]
   
Liabilities:    
Debt 49,851 29,591
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
   
Assets:    
Fair value      
Fair Value, Inputs, Level 3 [Member]
   
Liabilities:    
Debt      
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
   
Assets:    
Fair value