Incentive Compensation Plans and Retirement Plans (Restricted Stock Units) (Details) - Restricted stock units - 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]
Vesting period	3 years
Stock-based Compensation, Nonvested, Shares (in 000's) [Roll Forward]
March 31, 2017	340
Granted	430
Vested	(227)
Forfeited	(182)
March 31, 2018	361	340
Stock-based Compensation, Nonvested, Weighted Average Grant Date Fair Value (Per Share) [Roll Forward]
March 31, 2017	$ 14.24
Granted	7.92
Vested	12.37
Forfeited	10.65
March 31, 2018	$ 9.70	$ 14.24
Total fair value of shares vested	$ 454	$ 2,163	$ 3,167
Total unrecognized pre-tax stock-based compensation expense related to non-vested shares	$ 1,813
Weighted-average period of recognition	1 year 10 months