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Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax [Line Items]
Decrease in valuation allowance against deferred tax assets		$ 2,100,000
Uncertain tax positions		$ 0	$ 0	$ 0
Federal corporate tax rate	35.00%	21.00%
Deductibility percentage of certain capital expenditures		100.00%
Tax benefit from change in corporate tax rates on deferred tax liabilities	$ 61,000,000
State Income Tax [Member]
Income Tax [Line Items]
Investment credits		$ 2,000,000

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Income tax.

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Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Tax cuts and jobs act of 2017 deductibility percentage of certain capital expenditures.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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