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DEBT - Senior Notes (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2014 | Mar. 31, 2020 | Dec. 31, 2014 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Nov. 30, 2014
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemption and repayment of debt |  |  |  |  |  |  | $ 1,171,033,000 | $ 902,474,000 | $ 946,250,000 |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 22,538,000 | 0 | 0 |  |
Net change in unrealized gains or losses |  |  |  |  |  |  | (16,739,000) | (9,119,000) | (1,934,000) |  |
Unamortized discount |  |  |  |  |  |  | $ 8,167,000 | 8,738,000 |  |  |
Derivatives designated as hedging instruments | Treasury Lock | Cash flow hedge contracts- foreign currency |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 1,000,000,000.00 |  |  |  |  | $ 500,000,000.0 |  |
Derivatives designated as hedging instruments | Treasury Lock | Senior notes | Cash flow hedge contracts- foreign currency |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  | 10 years |  |  |  |  |  |  |
Derivatives designated as hedging instruments | Portion of Senior notes | Treasury Lock | Senior notes | Cash flow hedge contracts- foreign currency |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized gains or losses |  |  |  |  |  | $ 7,500,000 |  |  |  |  |
Derivatives designated as hedging instruments | Fixed-rate 3.300% Senior notes due on March 1, 2050 | Treasury Lock | Cash flow hedge contracts- foreign currency |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized gains or losses |  |  |  |  | $ 21,500,000 |  |  |  |  |  |
Derivatives designated as hedging instruments | Fixed-rate 3.300% Senior notes due on March 1, 2050 | Treasury Lock | Senior notes | Cash flow hedge contracts- foreign currency |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Term of contract |  | 30 years |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 | $ 2,500,000,000
Redemption and repayment of debt |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |
Redemption price |  |  |  |  |  |  | 101.00% |  |  |  |
Fair value disclosure |  |  |  |  |  |  | $ 4,010,000,000.00 | $ 3,700,000,000 |  |  |
Senior notes | Fixed-rate 3.300% Senior notes due on March 1, 2050 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 750,000,000.0 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.30% |  |  |  |  |  | 3.30% |  |  |  |
Senior notes | Fixed-rate 4.125% Senior Notes due on November 1, 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemption and repayment of debt | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 4.125% |  |  |  |
Senior notes | 2020 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | $ 300,000 |  |  |  |
Senior notes | 2019 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | 6,700,000 |  |  |  |
Senior notes | 2014 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | 4,000,000.0 |  |  |  |
Line of credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemption and repayment of debt | $ 200,000,000.0 |  |  |  |  |  | $ 400,000,000.0 |  |  |  |

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