| Condensed Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | |
|---|---|---|
| Sep. 30, 2013 | Sep. 30, 2012 | |
| Unrealized losses on available-for-sale investments, tax | $ (17,396) | $ (7,589) | 
| X | ||||||||||
| 
- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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