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Investments - Carrying Value (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jun. 30, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | $ 9,025 | $ 12,807
Held-to-maturity securities, maturities from 1-90 days | 1,002 | 2,243
Held-to-maturity securities, maturities from 91-360 days | 199 | 1,699
Held-to-maturity securities, maturities over 360 days | 799 | 1,048
Held-to-maturity securities, maturities less than 1 year | 955 | 353
Held-to-maturity securities, remaining maturities from 1-3 years | 2,449 | 3,160
Held-to-maturity securities | 5,404 | 8,503
Short-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total available-for-sale and held-to-maturity securities | 11,181 | 17,102
Long-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 3,248 | 4,208
Mutual Funds - Corporate & Government Debt |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 9,025 | 12,807
Mutual Funds - Corporate & Government Debt | Short-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 9,025 | 12,807
Time Deposits |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 2,000 | 4,990
Time Deposits | Short-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities from 1-90 days | 1,002 | 2,243
Held-to-maturity securities, maturities from 91-360 days | 199 | 1,699
Time Deposits | Long-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities over 360 days | 799 | 1,048
Fixed Income Bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 3,404 | 3,513
Fixed Income Bonds | Short-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities less than 1 year | 955 | 353
Fixed Income Bonds | Long-Term Investments |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, remaining maturities from 1-3 years | $ 2,449 | $ 3,160

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