Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
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	1.80%	1.90%	1.40%
Changes in tax reserves and valuation allowance	0.70%	1.60%	(3.10%)
Nondeductible goodwill	0.00%	0.00%	2.50%
Permanent book/tax differences (primarily §199 deduction)	(0.90%)	(2.20%)	(1.60%)
Other, net	(0.20%)	(3.30%)	(3.10%)
Effective Income Tax Rate, Continuing Operations, Total	36.40%	33.00%	31.10%