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Restructuring Costs (Cumulative Restructuring Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 2,083 $ 1,725 $ 4,890
Restructuring and impairment costs 4,359 2,389 4,890
Employee Termination Benefits [Member]      
Restructuring Cost and Reserve [Line Items]      
Employee termination benefits 2,083 1,629 4,354
Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Other restructuring costs 0 96 536
Farmer loans and property and equipment $ 2,276 $ 664 $ 0