Restructuring Costs (Cumulative Restructuring Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 5,356	$ 4,831
Asset impairment charges	2,187	15,473
Goodwill Impairment	0	889
Restructuring and impairment costs	7,543	20,304	$ 0
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits	5,356	4,608
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	0	223
Farmer loans and property and equipment	$ 2,187	$ 14,584