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Fair Value Measurements (Schedule of Fair Value for Financial Assets and Liabilities Measure on Recurring Basis) (Details) (Recurring, USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jun. 30, 2012
--- | --- | ---
Level 1 |  |
Assets |  |
Total | $ 71,580 | $ 36,141
Liabilities |  |
Total | 0 |
Level 2 |  |
Assets |  |
Total | 105,892 | 99,098
Liabilities |  |
Total | 16 |
Level 3 |  |
Assets |  |
Total | 0 | 0
Liabilities |  |
Total | 0 |
Total |  |
Assets |  |
Total | 177,472 | 135,239
Liabilities |  |
Total | 16 |
Municipal Bonds | Level 1 |  |
Assets |  |
Investments | 0 | 0
Municipal Bonds | Level 2 |  |
Assets |  |
Investments | 2,753 | 2,736
Municipal Bonds | Level 3 |  |
Assets |  |
Investments | 0 | 0
Municipal Bonds | Total |  |
Assets |  |
Investments | 2,753 | 2,736
Federal Agency Notes | Level 1 |  |
Assets |  |
Investments | 0 | 0
Federal Agency Notes | Level 2 |  |
Assets |  |
Investments | 11,256 | 11,234
Federal Agency Notes | Level 3 |  |
Assets |  |
Investments | 0 | 0
Federal Agency Notes | Total |  |
Assets |  |
Investments | 11,256 | 11,234
Money Market Funds | Level 1 |  |
Assets |  |
Investments | 71,580 | 36,141
Money Market Funds | Level 2 |  |
Assets |  |
Investments | 0 | 0
Money Market Funds | Level 3 |  |
Assets |  |
Investments | 0 | 0
Money Market Funds | Total |  |
Assets |  |
Investments | 71,580 | 36,141
Corporate Notes and Bonds | Level 1 |  |
Assets |  |
Investments | 0 | 0
Corporate Notes and Bonds | Level 2 |  |
Assets |  |
Investments | 91,883 | 84,949
Corporate Notes and Bonds | Level 3 |  |
Assets |  |
Investments | 0 | 0
Corporate Notes and Bonds | Total |  |
Assets |  |
Investments | 91,883 | 84,949
Forward Contracts | Level 1 |  |
Assets |  |
Foreign currency forward contracts |  | 0
Liabilities |  |
Foreign currency forward contracts | 0 |
Forward Contracts | Level 2 |  |
Assets |  |
Foreign currency forward contracts |  | 179
Liabilities |  |
Foreign currency forward contracts | 16 |
Forward Contracts | Level 3 |  |
Assets |  |
Foreign currency forward contracts |  | 0
Liabilities |  |
Foreign currency forward contracts | 0 |
Forward Contracts | Total |  |
Assets |  |
Foreign currency forward contracts |  | 179
Liabilities |  |
Foreign currency forward contracts | $ 16 |

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