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
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ESPP maximum employee subscription rate 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    
Tax benefits realized by the Company in connection with the disqualifying dispositions of shares purchased under the ESPP $ 847 $ 704
Weighted-average fair value per share based on Black-Scholes model (in dollars per share) $ 19.04 $ 14.06
ESPP maximum annual share replenishment (in shares) 2,000,000  
Number of ESPP shares available for future issuance (in shares) 2,700,000  
Employee Stock Purchase Plan    
ESPP, Fair Value Assumptions and Methodology    
Expected stock price volatility 25.90% 20.60%
Risk-free interest rate 0.90% 0.40%
Dividend yield 2.60% 2.90%
Expected life (in years) 6 months 6 months