Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
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, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jan. 02, 2018
Jan. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
ESPP maximum employee subscription rate         15.00% 10.00%
ESPP, offering period     6 months      
ESPP, discount from market price, lesser of commencement of offering period or purchase date     85.00%      
Employee Stock Purchase Plan Additional Information            
Total cash received from employees for the issuance of shares under the ESPP $ 0 $ 0 $ 20,579 $ 23,694    
Number of shares purchased by employees through the ESPP (in shares) 0 0 264,000 384,000    
Tax benefits realized by the Company in connection with the disqualifying dispositions of shares purchased under the ESPP $ 787 $ 1,035 $ 1,681 $ 1,957    
Weighted-average fair value per share based on Black-Scholes model (in dollars per share) $ 23.61 $ 16.47 $ 21.89 $ 15.14    
ESPP maximum annual share replenishment (in shares) 2,000,000   2,000,000      
Number of ESPP shares available for future issuance (in shares) 2,400,000   2,400,000      
Employee Stock Purchase Plan            
ESPP, Fair Value Assumptions and Methodology            
Expected stock price volatility 31.50% 26.10% 28.70% 23.40%    
Risk-free interest rate 1.30% 0.50% 1.10% 0.50%    
Dividend yield 2.40% 2.70% 2.50% 2.80%    
Expected life (in years) 6 months 6 months 6 months 6 months