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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate |  | 37.20% | (311.10%) |
Increase in income tax expense |  | $ 920,200 |  |
Income tax benefit from reorganization | $ 876,100 | 0 | $ 876,114 | $ 0
Effect of U.S. tax reform |  | 19,037 | 0 | $ 0
Increase in income tax expense of federal rate applied to pretax income |  | 29,900 |  |
Increase (decrease) in differences in tax filings from provision |  | 9,200 |  |
Decrease from reversal of reserves |  | 8,900 |  |
Decrease in deferred tax assets valuation allowance, amount |  | 2,100 |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Investment tax credit |  | 55,200 |  |
Unrecognized tax benefits of deferred tax assets offset by valuation allowance |  | 10,500 |  |
Net unrecognized tax benefit excluding portion offset by valuation allowance |  | 167,200 | 163,000 |
Increase resulting from prior period tax positions, subject to recovery as an indemnified asset |  | 0 | 9,400 |
Possible decrease in tax expense in next 12 months |  | 9,100 |  |
Taxes paid on cash distribution |  | 28,500 | $ 22,100 |
Adjustment of deferred tax assets and liabilities |  | $ 19,000 |  |
Impact of changes in US tax legislation, as a percent |  | 4.90% |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 60,800 |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards |  | 471,500 |  |
Deferred tax assets, operating loss carryforwards, not subject to expiration |  | $ 65,300 |  |

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