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Fair Value Measurement (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Jun. 30, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual funds | $ 12,719 | $ 17,227
Mutual funds, fair value | 12,719 | 17,227
Held-to-maturity securities, maturities less than 1 year | 253 |
Held-to-maturity securities, maturities less than 1 year, fair value | 251 |
Held-to-maturity securities, remaining maturities from 1-3 years | 3,257 | 2,073
Held-to-maturity securities, remaining maturities from 1-3 years, fair value | 3,250 | 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, maturities from 1-90 days | 747 | 1,496
Held-to-maturity securities, maturities from 1-90 days, fair value | 747 | 1,496
Held-to-maturity securities, maturities from 91-360 days | 3,939 | 4,438
Held-to-maturity securities, maturities from 91-360 days, fair value | 3,943 | 4,440
Held-to-maturity securities, maturities over 360 days | 1,047 | 4,990
Held-to-maturity securities, maturities over 360 days, fair value | 1,048 | 4,993
Investments | 21,962 | 31,677
Investments, fair value | 21,958 | 31,651
Fair Value Inputs Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual funds, fair value | 12,719 | 17,227
Investments, fair value | 12,719 | 17,227
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 | 251 |
Held-to-maturity securities, remaining maturities from 1-3 years, fair value | 3,250 | 2,057
Held-to-maturity securities, remaining maturities from 3-5 years, fair value |  | 1,438
Held-to-maturity securities, maturities from 1-90 days, fair value | 747 | 1,496
Held-to-maturity securities, maturities from 91-360 days, fair value | 3,943 | 4,440
Held-to-maturity securities, maturities over 360 days, fair value | 1,048 | 4,993
Investments, fair value | $ 9,239 | $ 14,424

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