|
Marketable Securities (Continuous Unrealized Loss Position) (Details) (USD $) |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013 |
Mar. 31, 2012 |
Mar. 31, 2013 |
Mar. 31, 2012 |
|||||
| Investments in an Unrealized Loss Position | ||||||||
| Fair Value | $ 335,063,000 | $ 335,063,000 | ||||||
| Gross Unrealized Losses, less than 12 months | (397,000) | [1] | (397,000) | [1] | ||||
| Continuous loss position not exceeding this period | 12 months | |||||||
| Net realized securities gains (losses) | 700,000 | 100,000 | 2,100,000 | 700,000 | ||||
|
U.S. Treasury securities |
||||||||
| Investments in an Unrealized Loss Position | ||||||||
| Fair Value | 1,996,000 | 1,996,000 | ||||||
| Gross Unrealized Losses, less than 12 months | (1,000) | [1] | (1,000) | [1] | ||||
|
U.S. Government agency securities |
||||||||
| Investments in an Unrealized Loss Position | ||||||||
| Fair Value | 63,513,000 | 63,513,000 | ||||||
| Gross Unrealized Losses, less than 12 months | (6,000) | [1] | (6,000) | [1] | ||||
|
Municipal securities |
||||||||
| Investments in an Unrealized Loss Position | ||||||||
| Fair Value | 29,376,000 | 29,376,000 | ||||||
| Gross Unrealized Losses, less than 12 months | (62,000) | [1] | (62,000) | [1] | ||||
|
Corporate debt securities |
||||||||
| Investments in an Unrealized Loss Position | ||||||||
| Fair Value | 232,589,000 | 232,589,000 | ||||||
| Gross Unrealized Losses, less than 12 months | (321,000) | [1] | (321,000) | [1] | ||||
|
Sovereign securities |
||||||||
| Investments in an Unrealized Loss Position | ||||||||
| Fair Value | 7,589,000 | 7,589,000 | ||||||
| Gross Unrealized Losses, less than 12 months | $ (7,000) | [1] | $ (7,000) | [1] | ||||
|
||||||||