Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans (Fair Value Assumptions) (Details)

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Equity and Long-Term Incentive Compensation Plans (Fair Value Assumptions) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2010
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2013
Total cash received from employees for the issuance of shares under the ESPP $ 0 $ 0   $ 20,139 $ 19,195  
Number of shares purchased by employees through the ESPP 0 0   496,000 545,000  
ESPP maximum employee subscription rate 10.00%     10.00%    
Employee stock purchase plan offering period     6 months      
Share-based compensation arrangement, discount from market price, lesser of commencement of offering period or purchase date       85.00%    
ESPP maximum annual share replenishment           2,000,000
Number of ESPP shares available for future issuance 2,100,000     2,100,000    
Share-based Compensation Arrangement, Fair Value Assumptions and Methodology [Abstract]            
Expected stock price volatility 27.50% 39.30%   28.90% 36.00%  
Risk-free interest rate 0.10% 0.10%   0.10% 0.10%  
Dividend yield 3.20% 3.00%   3.30% 3.20%  
Expected life of options 6 months 6 months   6 months 6 months  
Employee Stock Purchase Plan Additional Information [Abstract]            
Tax benefits realized by the Company in connection with the disqualifying dispositions of shares purchased under the ESPP $ 724 $ 1,289   $ 1,398 $ 2,132  
Weighted-average fair value per share based on Black-Scholes model $ 10.36 $ 11.26   $ 10.46 $ 10.07