Restructuring Costs (Cumulative Restructuring Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 2,083	$ 1,725
Restructuring and impairment costs	$ 0	4,359	2,389
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits		2,083	1,629
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		0	96
Farmer loans and property and equipment		$ 2,276	$ 664