Incentive Compensation Plans and Retirement Plans (Performance Share Awards) (Details) - Performance share awards - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance goals measuring period	3 years
Stock-based Compensation, Fair Value Assumptions [Abstract]
Risk-free interest rate	1.40%	0.90%	0.90%
Expected volatility	46.70%	45.10%	39.90%
Dividend yield	3.90%	3.40%	2.00%
Stock-based Compensation, Nonvested, Shares (in 000's) [Roll Forward]
March 31, 2017	319
Granted	309
Vested	(68)
Forfeited	(233)
March 31, 2018	327	319
Stock-based Compensation, Nonvested, Weighted Average Grant Date Fair Value (Per Share) [Roll Forward]
March 31, 2017	$ 15.93
Granted	8.26
Vested	23.05
Forfeited	10.41
March 31, 2018	$ 11.14	$ 15.93
Total fair value of shares vested	$ 0	$ 0	$ 0
Total unrecognized pre-tax stock-based compensation expense related to non-vested shares	$ 640
Weighted-average period of recognition	1 year 10 months