Investments - Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, current	$ 14,508
Held-to-maturity securities, maturities from 1-90 days	950	$ 1,496
Held-to-maturity securities, maturities from 91-360 days	5,735	4,438
Held-to-maturity securities, maturities over 360 days	2,742	4,990
Held-to-maturity securities, remaining maturities from 1-3 years	2,427	2,073
Held-to-maturity securities, remaining maturities from 3-5 years	1,088	1,453
Held-to-maturity securities	12,942		$ 0
Short-Term Investments
Schedule of Held-to-maturity Securities [Line Items]
Total available-for-sale and held-to-maturity securities	21,193	23,161
Long-Term Investments
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	6,257	8,516
Mutual Funds - Corporate & Government Debt
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, current	14,508	17,227
Time Deposits
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	9,427
Time Deposits | Short-Term Investments
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, maturities from 1-90 days		1,496
Held-to-maturity securities, maturities from 91-360 days		4,438
Time Deposits | Long-Term Investments
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, maturities over 360 days		4,990
Fixed Income Bonds
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 3,515
Fixed Income Bonds | Long-Term Investments
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, remaining maturities from 1-3 years		2,073
Held-to-maturity securities, remaining maturities from 3-5 years		$ 1,453