| Subsequent Events (Details) (USD $) | 1 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
| Aug. 06, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011 | Jul. 09, 2013 | |
| Subsequent Events | |||||
| Common stock, dividends per share, authorized, quarterly levels | $ 0.40 | $ 0.35 | $ 0.45 | ||
| Common stock, dividends, per share, declared | $ 0.45 | $ 1.60 | $ 1.40 | $ 1.00 | |
| Dividends payable, date declared | Aug. 06, 2013 | ||||
| Dividends payable, date to be paid | Sep. 03, 2013 | ||||
| Dividends payable, date of record | Aug. 16, 2013 | ||||
| X | ||||||||||
| 
- Definition Common Stock Dividends Per Share Authorized No definition available. 
 | 
| X | ||||||||||
| 
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
 |