| Equity and Long-Term Incentive Compensation Plans  - Equity Incentive Program (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 31, 2014  USD ($)  shares | Mar. 31, 2016  shares | Mar. 31, 2016  USD ($)  plan  shares | Mar. 31, 2015  USD ($) | ||||||||
| Share-based Compensation Arrangement by Share-based Payment Award | |||||||||||
| Number of plans | plan | 2 | ||||||||||
| Shares available for issuance (in shares) | [1],[2] | 7,810,000 | 6,709,000 | ||||||||
| Total Shares Available for Grant under the Company's equity incentive plans: | |||||||||||
| Balances as of June 30, 2015 (in shares) | [1],[2] | 7,810,000 | |||||||||
| Balances as of March 31, 2016 (in shares) | [1],[2] | 6,709,000 | |||||||||
| Adjustments in period (in shares) | 4,245 | ||||||||||
| Dividends payable - financing activities | $ | $ 18,827 | $ 41,412 | |||||||||
| 2004 Plan | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award | |||||||||||
| Shares available for issuance (in shares) | 5,000,000 | 5,000,000 | |||||||||
| Percent of fair market value on grant date (as a percent) | 100.00% | ||||||||||
| Total Shares Available for Grant under the Company's equity incentive plans: | |||||||||||
| Balances as of March 31, 2016 (in shares) | 5,000,000 | ||||||||||
| Share reserve multiplier | |||||||||||
| Total Shares Available for Grant under the Company's equity incentive plans: | |||||||||||
| Restricted stock units granted (in shares) | [2],[3] | (1,541,000) | |||||||||
| Restricted stock units canceled (in shares) | [2] | 440,000 | |||||||||
| Outside Director Option Plan | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award | |||||||||||
| Shares available for issuance (in shares) | 1,700,000 | 1,700,000 | |||||||||
| Total Shares Available for Grant under the Company's equity incentive plans: | |||||||||||
| Balances as of March 31, 2016 (in shares) | 1,700,000 | ||||||||||
| Restricted stock unit, performance-based and service-based | |||||||||||
| Total Shares Available for Grant under the Company's equity incentive plans: | |||||||||||
| Dividends payable - financing activities | $ | $ 18,800 | ||||||||||
| Restricted stock unit, performance-based and service-based | Special cash dividend | |||||||||||
| Total Shares Available for Grant under the Company's equity incentive plans: | |||||||||||
| Dividends payable - financing activities | $ | $ 43,000 | $ 16,900 | |||||||||
| Awards Granted before November 6, 2013 | 2004 Plan | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award | |||||||||||
| 2004 Plan shares reserve multiplier | 1.8 | ||||||||||
| Awards Granted after November 6, 2013 | 2004 Plan | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award | |||||||||||
| 2004 Plan shares reserve multiplier | 2.0 | ||||||||||
| 
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