|
Marketable Securities (Continuous Unrealized Loss Position) (Details) (USD $) |
3 Months Ended | ||||
|---|---|---|---|---|---|
|
Sep. 30, 2011 |
Sep. 30, 2010 |
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| Investments in an Unrealized Loss Position | |||||
| Months in Loss Position Not Exceeding this Period | 12 | ||||
| Fair Value | $ 444,425,000 | ||||
| Gross Unrealized Losses | (2,577,000) | ||||
| 净实现证券收益 | 700,000 | 1,000,000 | |||
|
US Treasury securities |
|||||
| Investments in an Unrealized Loss Position | |||||
| Fair Value | 25,868,000 | ||||
| Gross Unrealized Losses | （36,000） | [1] | |||
|
US Government agency securities |
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| Investments in an Unrealized Loss Position | |||||
| Fair Value | 134,278,000 | ||||
| Gross Unrealized Losses | (338,000) | [1] | |||
|
Municipal securities |
|||||
| Investments in an Unrealized Loss Position | |||||
| Fair Value | 1,443,000 | ||||
| Gross Unrealized Losses | (3,000) | [1] | |||
|
公司债务证券 |
|||||
| Investments in an Unrealized Loss Position | |||||
| Fair Value | 280,339,000 | ||||
| Gross Unrealized Losses | （2,196,000） | [1] | |||
|
Sovereign securities |
|||||
| Investments in an Unrealized Loss Position | |||||
| Fair Value | 2,497,000 | ||||
| Gross Unrealized Losses | $ (4,000) | [1] | |||
|
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