Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Effective federal income tax rates on income (Loss) from continuing operation before income tax
U.S. federal statutory rate	35.00%	35.00%	35.00%
State income taxes, less federal benefit	0.50%	1.90%	1.80%
Foreign tax rate differential	(7.60%)	0.00%	0.00%
Bargain purchase gain	(20.90%)	0.00%	0.00%
Changes in tax reserves and valuation allowance	(1.90%)	0.70%	0.70%
Permanent book/tax differences (primarily §199 deduction)	(0.20%)	(2.40%)	(0.90%)
Other, net	(0.90%)	0.10%	(0.20%)
Effective Income Tax Rate, Continuing Operations, Total	4.00%	35.30%	36.40%