Derivative Financial Instruments - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Current derivative assets	$ 0	$ 186,000
Derivative contracts outstanding	0
Cost of goods and services sold
Derivative [Line Items]
Gain (loss) recognized in income	(3,331,000)	(1,899,000)	$ (1,818,000)
Loss on Derivatives
Derivative [Line Items]
Unrealized losses on designated cash flow hedges	531,000	2,614,000
Tax of unrealized losses on designated cash flow hedges	$ 0	$ (695,000)