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Income Taxes - Effective Tax Rate Reconciliation (Details)
5 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Oct. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. federal statutory rate 35.00% 21.00% 32.00% 35.00%
State income taxes, net of federal impact 4.00% 5.00% 4.00% 4.00%
Non-deductible transaction costs 0.00% 3.00% 4.00% 0.00%
Remeasurement of state deferred income tax items 0.00% 5.00% 0.00% 0.00%
State valuation allowance 0.00% 3.00% 0.00% 0.00%
Research and development credit (1.00%) (3.00%) (0.00%) (1.00%)
Unrecognized tax benefits 0.00% 1.00% 0.00% 0.00%
Interest on federal tax refund, net of tax expense 0.00% (2.00%) 0.00% 0.00%
Impact of Tax Act 0.00% 1.00% (44.00%) 0.00%
Other items, net 1.00% 2.00% (1.00%) 0.00%
Effective tax rate 39.00% 36.00% (5.00%) 38.00%