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