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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