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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds $ 17,227  
Mutual funds, fair value 17,227  
Held-to-maturity securities, remaining maturities from 1-3 years 2,073  
Held-to-maturity securities, remaining maturities from 1-3 years, fair value 2,057  
Held-to-maturity securities, remaining maturities from 3-5 years 1,453  
Held-to-maturity securities, remaining maturities from 3-5 years, fair value 1,438  
Held-to-maturity securities, 1-90 days 1,496  
Held-to-maturity securities, 1-90 days, fair value 1,496  
Held-to-maturity securities, 91-360 days 4,438  
Held-to-maturity securities, 91-360 days, fair value 4,440  
Held-to-maturity securities, over 360 days 4,990  
Held-to-maturity securities, over 360 days, fair value 4,993  
Notes payable   $ 5,655
Notes payable, fair value   5,655
Investments 31,677 5,655
Investments, fair value 31,651 5,655
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds, fair value 17,227  
Investments, fair value 17,227  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity securities, remaining maturities from 1-3 years, fair value 2,057  
Held-to-maturity securities, remaining maturities from 3-5 years, fair value 1,438  
Held-to-maturity securities, 1-90 days, fair value 1,496  
Held-to-maturity securities, 91-360 days, fair value 4,440  
Held-to-maturity securities, over 360 days, fair value 4,993  
Notes payable, fair value   5,655
Investments, fair value $ 14,424 $ 5,655