Quarterly report pursuant to Section 13 or 15(d)

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

v3.6.0.2
Equity and Long-Term Incentive Compensation Plans - Employee Stock Purchase Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 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) 20.60% 23.90% 20.60% 23.90%
Risk-free interest rate (as a percent) 0.40% 0.10% 0.40% 0.10%
Dividend yield (as a percent) 3.00% 3.70% 3.00% 3.70%
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 $ 23,694 $ 21,908 $ 23,694 $ 21,908
Number of shares purchased by employees through the ESPP (in shares) 384,000 454,000 384,000 454,000
Tax benefits realized by the Company in connection with the disqualifying dispositions of shares purchased under the ESPP $ 218 $ 339 $ 922 $ 719
Weighted-average fair value per share based on Black-Scholes model (in dollars per share) $ 14.05 $ 11.34 $ 14.05 $ 11.34
ESPP maximum annual share replenishment (in shares) 2,000,000   2,000,000  
Number of ESPP shares available for future issuance (in shares) 1,000,000   1,000,000