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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2014 | Oct. 31, 2014
Derivative |  |  |  |  |
Unamortized portion of the fair value of the forward contracts | $ 4,200,000 | $ 4,200,000 |  |  |
Realized net loss | 1,379,000 | 6,567,000 |  |  |
2018 Rate lock agreements |  |  |  |  |
Derivative |  |  |  |  |
Unamortized portion of the fair value of the forward contracts | 13,500,000 | $ 13,500,000 |  |  |
2018 Rate lock agreements | Senior notes |  |  |  |  |
Derivative |  |  |  |  |
Realized net loss | $ (13,600,000) |  |  |  |
Derivatives designated as hedging instruments | Cash flow hedge contracts - foreign currency | Portion of senior notes | Treasury lock | Senior notes |  |  |  |  |
Derivative |  |  |  |  |
Unrealized gains (losses) on cash flow hedges |  |  |  | $ 7,500,000 |
Derivative, notional amount |  |  |  |  | $ 1,000,000,000.00
Derivatives designated as hedging instruments | Cash flow hedge contracts - foreign currency | 2018 Rate lock agreements | Treasury lock | Senior notes |  |  |  |  |
Derivative |  |  |  |  |
Derivative, notional amount |  |  | $ 500,000,000 |  |

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