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Income Taxes - Effective Tax Rate Reconciliation (Details)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. federal statutory rate 21.00% 21.00% 32.00%
State income taxes, net of federal impact 1.00% 5.00% 4.00%
Non-deductible transaction costs 0.00% 3.00% 4.00%
Goodwill impairment (18.00%) 0.00% 0.00%
Remeasurement of state deferred income tax items 0.00% 5.00% 0.00%
State valuation allowance 0.00% 3.00% 0.00%
Research and development credit (0.00%) (3.00%) (0.00%)
Unrecognized tax benefits 4.00% 1.00% 0.00%
Interest on federal tax refund, net of tax expense 0.00% (2.00%) 0.00%
Impact of Tax Act 0.00 0.01 (0.44)
Other items, net (1.00%) 2.00% (1.00%)
Effective tax rate 7.00% 36.00% (5.00%)