| 
           Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) (USD $) 
        In Thousands, unless otherwise specified  | 
        12 Months Ended | ||
|---|---|---|---|
| 
           Jun. 30, 2014 
         | 
        
           Jun. 30, 2013 
         | 
        
           Jun. 30, 2012 
         | 
      |
| Unrealized gains (losses) on available-for-sale investments, tax | $ (17,110) | $ (2,129) | $ 23,422 | 
| 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 
  |