Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans - Employee Stock Purchase Plan (Details)

v3.4.0.3
Equity and Long-Term Incentive Compensation Plans - Employee Stock Purchase Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
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 (percent)     85.00%  
Share-based Compensation Arrangement, Fair Value Assumptions and Methodology        
Expected stock price volatility (as a percent) 26.80% 25.50% 25.40% 24.50%
Risk-free interest rate (as a percent) 0.20% 0.10% 0.20% 0.10%
Dividend yield (as a percent) 3.00% 2.90% 3.30% 2.80%
Expected life (in years) 6 months 6 months 6 months 6 months
Employee Stock Purchase Plan Additional Information        
Total cash received from employees for the issuance of shares under the ESPP $ 0 $ 0 $ 21,908 $ 24,186
Number of shares purchased by employees through the ESPP (in shares) 0 0 454,000 405,000
Tax benefits realized by the Company in connection with the disqualifying dispositions of shares purchased under the ESPP $ 1,203 $ 411 $ 1,922 $ 1,600
Weighted-average fair value per share based on Black-Scholes model (per share) $ 14.29 $ 14.40 $ 12.44 $ 14.55
ESPP maximum annual share replenishment (in shares) 2,000,000   2,000,000  
Number of ESPP shares available for future issuance (in shares) 1,700,000   1,700,000