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Equity and Long-Term Incentive Compensation Plans - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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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 |

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- Definition Employee Stock Purchase Plan Additional Information [Abstract] + References No definition available. + Details
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- Definition Employee Stock Purchase Plan Offering Period + References No definition available. + Details
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- Definition Espp Maximum Annual Share Replenishment + References No definition available. + Details
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- Definition Number Of Espp Shares Available For Future Issuance + References No definition available. + Details
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- Definition Tax Benefits Realized From Espp + References No definition available. + Details
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- Definition Weighted Average Fair Value Per Share + References No definition available. + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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