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Investments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019
Investments [Abstract] |  |  |
Short-term investments | $ 3,100,000 |  | $ 2,300,000
Available-for-sale debt securities | 0 |  | 0
Sales of available-for-sale investments | $ 0 | $ 1,376,600,000 | 1,380,000,000
Gross realized losses |  |  | $ 5,600,000

X
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