Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Line Items]
Provision for income taxes at U.S. federal statutory tax rate	21.00%	35.00%	31.60%	35.00%	35.00%
Income tax benefit attributable to revaluation of net deferred tax liabilities			$ 2,900,000,000
Provisional deemed repatriation tax			10,000,000
Deferred Tax Assets, Tax Credit Carryforwards, Federal and State	$ 8,000,000		8,000,000	$ 0
Deferred tax asset for foreign tax credit carryforward	10,000,000		10,000,000
Valuation Allowance	29,000,000		29,000,000	21,000,000
Unremitted earnings in foreign subsidiary	223,000,000		223,000,000	220,000,000
Income Tax Penalties Accrued	0		0	0	$ 0
Federal [Member]
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards	857,000,000		$ 857,000,000	0
Expiration Dates			Mar. 31, 2028
State [Member]
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards	$ 109,000,000		$ 109,000,000	$ 59,000,000
Expiration Dates			Mar. 31, 2020