Fair Value Measurement (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds	$ 9,025	$ 12,807
Mutual funds, fair value	9,025	12,807
Held-to-maturity securities, maturities less than 1 year	955	353
Held-to-maturity securities, maturities less than 1 year, fair value	954	352
Held-to-maturity securities, remaining maturities from 1-3 years	2,449	3,160
Held-to-maturity securities, remaining maturities from 1-3 years, fair value	2,439	3,166
Held-to-maturity securities, maturities from 1-90 days	1,002	2,243
Held-to-maturity securities, maturities from 1-90 days, fair value	1,002	2,244
Held-to-maturity securities, maturities from 91-360 days	199	1,699
Held-to-maturity securities, maturities from 91-360 days, fair value	199	1,703
Held-to-maturity securities, maturities over 360 days	799	1,048
Held-to-maturity securities, maturities over 360 days, fair value	800	1,050
Investments	14,429	21,310
Investments, fair value	14,419	21,322
Fair Value Inputs Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds, fair value	9,025	12,807
Investments, fair value	9,025	12,807
Fair Value Inputs Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities, maturities less than 1 year, fair value	954	352
Held-to-maturity securities, remaining maturities from 1-3 years, fair value	2,439	3,166
Held-to-maturity securities, maturities from 1-90 days, fair value	1,002	2,244
Held-to-maturity securities, maturities from 91-360 days, fair value	199	1,703
Held-to-maturity securities, maturities over 360 days, fair value	800	1,050
Investments, fair value	$ 5,394	$ 8,515