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Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Income Tax Rate (Details)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Federal tax at statutory rate	21.00%	21.00%	31.60%
State income taxes, net of federal benefit	1.70%	1.40%	1.50%
Non-controlling interest	(9.80%)	(10.80%)	(19.80%)
Foreign income taxes	0.00%	0.00%	(0.40%)
Valuation allowance	(0.90%)	1.90%	(1.60%)
Tax reform impact	0.00%	0.00%	13.70%
Deferred tax asset state apportionment changes	0.00%	10.30%	0.00%
Other	(2.10%)	(0.20%)	(1.10%)
Effective tax rate	9.90%	23.60%	23.90%

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Effective Income Tax Rate Reconciliation, Deferred Tax Asset, Change In State Apportionment, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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