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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Oct. 31, 2014 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2014 | Mar. 31, 2020 | Mar. 31, 2019 | Feb. 29, 2020 | Jun. 30, 2018 | Nov. 30, 2014
Derivative |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) arising during the period |  |  | $ (19,333,000) | $ (1,379,000) |  | $ (17,785,000) | $ (6,567,000) |  |  |
Reclassification adjustments for net (gains) losses included in net income |  |  | $ (2,904,000) | (946,000) |  | $ (1,252,000) | (3,719,000) |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 1,200,000,000 |  |  | 1,200,000,000 |  |  | $ 2,500,000,000
Fixed-rate 3.300% Senior Notes due on March 1, 2050 | Senior notes |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 750,000,000.0 |  |
Stated interest rate |  |  | 3.30% |  |  | 3.30% |  | 3.30% |  |
Senior notes due November 1, 2024 | Senior notes |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 1,250,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  | 4.65% | 4.65% |  |  | 4.65% |  |  |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts - foreign currency | Treasury lock | Fixed-rate 3.300% Senior Notes due on March 1, 2050 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Term of contract | 30 years |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 350,000,000.0 |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) arising during the period |  |  | $ (21,500,000) |  |  |  |  |  |  |
Reclassification adjustments for net (gains) losses included in net income |  |  | 100,000 |  |  | $ 100,000 |  |  |  |
Unamortized portion of the fair value of derivative |  |  | 21,500,000 |  |  | 21,500,000 |  |  |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts - foreign currency | Treasury lock | 2018 Rate lock agreements |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  | $ 500,000,000.0 |
Net unrealized gains (losses) arising during the period |  |  |  | (13,600,000) |  |  |  |  |  |
Reclassification adjustments for net (gains) losses included in net income |  |  | 300,000 |  |  | 900,000 |  |  |  |
Unamortized portion of the fair value of derivative |  |  | 12,400,000 |  |  | 12,400,000 |  |  |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts - foreign currency | Treasury lock | Portion of senior notes |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Term of contract |  | 10 years |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 1,000,000,000.00 |  |  |  |  |  |  |  |
Net unrealized gains (losses) arising during the period |  |  |  |  | $ 7,500,000 |  |  |  |  |
Reclassification adjustments for net (gains) losses included in net income |  |  | 200,000 | $ 200,000 |  | 600,000 | $ 400,000 |  |  |
Unamortized portion of the fair value of derivative |  |  | $ 3,500,000 |  |  | $ 3,500,000 |  |  |  |
Maximum | Derivatives designated as hedging instruments | Cash flow hedge contracts - foreign currency | Treasury lock |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  |  |  | 18 months |  |  |  |

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