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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 12,890	$ 21,310
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	12,890	21,322
Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	9,043	12,807
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	3,847	8,515
Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Mutual Funds - Corporate & Government Debt | Carrying Value | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	9,043	12,807
Mutual Funds - Corporate & Government Debt | Fair Value | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	9,043	12,807
Mutual Funds - Corporate & Government Debt | Fair Value | Short-term Investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	9,043	12,807
Mutual Funds - Corporate & Government Debt | Fair Value | Short-term Investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Mutual Funds - Corporate & Government Debt | Fair Value | Short-term Investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Fixed Income Bonds | Carrying Value | Short-term Investments | Maturities less than 1 year
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,607	353
Fixed Income Bonds | Carrying Value | Long-term Investments | Maturities from 1-3 years
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,441	3,160
Fixed Income Bonds | Fair Value | Short-term Investments | Maturities less than 1 year
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,607	352
Fixed Income Bonds | Fair Value | Short-term Investments | Maturities less than 1 year | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Fixed Income Bonds | Fair Value | Short-term Investments | Maturities less than 1 year | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,607	352
Fixed Income Bonds | Fair Value | Short-term Investments | Maturities less than 1 year | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Fixed Income Bonds | Fair Value | Long-term Investments | Maturities from 1-3 years
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,441	3,166
Fixed Income Bonds | Fair Value | Long-term Investments | Maturities from 1-3 years | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Fixed Income Bonds | Fair Value | Long-term Investments | Maturities from 1-3 years | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,441	3,166
Fixed Income Bonds | Fair Value | Long-term Investments | Maturities from 1-3 years | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Time Deposits | Carrying Value | Short-term Investments | Maturities from 1-90 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	2,243
Time Deposits | Carrying Value | Short-term Investments | Maturities from 91-360 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	250	1,699
Time Deposits | Carrying Value | Long-term Investments | Maturities over 360 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	549	1,048
Time Deposits | Fair Value | Short-term Investments | Maturities from 1-90 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	2,244
Time Deposits | Fair Value | Short-term Investments | Maturities from 1-90 days | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Time Deposits | Fair Value | Short-term Investments | Maturities from 1-90 days | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	2,244
Time Deposits | Fair Value | Short-term Investments | Maturities from 1-90 days | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Time Deposits | Fair Value | Short-term Investments | Maturities from 91-360 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	250	1,703
Time Deposits | Fair Value | Short-term Investments | Maturities from 91-360 days | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Time Deposits | Fair Value | Short-term Investments | Maturities from 91-360 days | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	250	1,703
Time Deposits | Fair Value | Short-term Investments | Maturities from 91-360 days | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Time Deposits | Fair Value | Long-term Investments | Maturities over 360 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	549	1,050
Time Deposits | Fair Value | Long-term Investments | Maturities over 360 days | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Time Deposits | Fair Value | Long-term Investments | Maturities over 360 days | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	549	1,050
Time Deposits | Fair Value | Long-term Investments | Maturities over 360 days | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 0	$ 0

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