Fair Value Measurement (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual Funds	$ 12,703	$ 17,227
Mutual Funds, fair value	12,703	17,227
Held-to-maturity securities, remaining maturities from 1-3 years	2,800	2,073
Held-to-maturity securities, remaining maturities from 1-3 years, fair value	2,761	2,057
Held-to-maturity securities, remaining maturities from 3-5 years	720	1,453
Held-to-maturity securities, remaining maturities from 3-5 years, fair value	710	1,438
Held-to-maturity securities, maturities from 1-90 days	1,753	1,496
Held-to-maturity securities, maturities from 1-90 days, fair value	1,753	1,496
Held-to-maturity securities, maturities from 91-360 days	3,736	4,438
Held-to-maturity securities, maturities from 91-360 days, fair value	3,735	4,440
Held-to-maturity securities, maturities over 360 days	2,248	4,990
Held-to-maturity securities, maturities over 360 days, fair value	2,240	4,993
Investments	23,960	31,677
Investments, fair value	23,902	31,651
Fair Value Inputs Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual Funds, fair value	12,703	17,227
Investments, fair value	12,703	17,227
Fair Value Inputs 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	2,761	2,057
Held-to-maturity securities, remaining maturities from 3-5 years, fair value	710	1,438
Held-to-maturity securities, maturities from 1-90 days, fair value	1,753	1,496
Held-to-maturity securities, maturities from 91-360 days, fair value	3,735	4,440
Held-to-maturity securities, maturities over 360 days, fair value	2,240	4,993
Investments, fair value	$ 11,199	$ 14,424