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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Nov. 30, 2014 | Oct. 31, 2014
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Debt Instrument |  |  |  |  |  |
Total debt, gross |  | $ 2,790,000 |  | $ 2,946,250 |  |
Unamortized discount |  | (2,798) |  | (2,901) |  |
Unamortized debt issuance costs |  | (12,364) |  | (12,892) |  |
Total debt, net of discount |  | 2,774,838 |  | 2,930,457 |  |
Current portion of long-term debt |  | 249,996 |  | 249,983 |  |
Long-term debt |  | $ 2,524,842 |  | 2,680,474 |  |
Portion of senior notes | Cash flow hedge contracts | Senior notes | Treasury lock | Derivatives designated as hedging instruments |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Effective percentage including treasury rate lock hedge |  | 4.626% |  |  |  |
Senior notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Unamortized discount |  |  |  |  | $ (4,000) |
Senior notes | Fixed-rate 2.375% Senior notes due on November 1, 2017 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Stated interest rate |  | 2.375% |  |  |  |
Total debt, gross |  | $ 250,000 |  | $ 250,000 |  |
Effective interest rate |  | 2.396% |  | 2.396% |  |
Senior notes | Fixed-rate 3.375% Senior notes due on November 1, 2019 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Stated interest rate |  | 3.375% |  |  |  |
Total debt, gross |  | $ 250,000 |  | $ 250,000 |  |
Effective interest rate |  | 3.377% |  | 3.377% |  |
Senior notes | Fixed-rate 4.125% Senior notes due on November 1, 2021 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Stated interest rate |  | 4.125% |  |  |  |
Total debt, gross |  | $ 500,000 |  | $ 500,000 |  |
Effective interest rate |  | 4.128% |  | 4.128% |  |
Senior notes | Fixed-rate 4.650% Senior notes due on November 1, 2024 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Stated interest rate |  | 4.65% | [1] |  |  | 4.65%
Total debt, gross | [1] | $ 1,250,000 |  | $ 1,250,000 |  |
Effective interest rate | [1] | 4.682% |  | 4.682% |  |
Senior notes | Fixed-rate 5.650% Senior notes due on November 1, 2034 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Stated interest rate |  | 5.65% |  |  |  |
Total debt, gross |  | $ 250,000 |  | $ 250,000 |  |
Effective interest rate |  | 5.67% |  | 5.67% |  |
Term loans |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total debt, gross |  | $ 290,000 |  | $ 446,250 |  |
Effective interest rate |  | 2.55% |  | 2.137% |  |
[1] | The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.

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