Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($)	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Long-term Line of Credit	$ 150,000,000
Face amount of guarantee including unpaid accrued interest	0	$ 5,100,000	$ 3,000,000.0
Fair value of the guarantees	0	131,000	103,000
Other contingent liabilities	1,000,000
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers	2,753,000	93,000
Issuance of long-term debt	150,000,000	0
Loans Payable	150,000,000
Stock repurchase program authorized amount	100,000,000
Stock repurchase program remaining authorized repurchase amount	100,000,000
Five-year term loan [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Issuance of long-term debt	75,000,000
Loans Payable	225,000,000
Seven-year term loan [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Issuance of long-term debt	75,000,000
Loans Payable	295,000,000
Advances to suppliers [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Advances to suppliers current and non-current	122,000,000	142,000,000	153,000,000
Valuation allowances	16,000,000	18,000,000	16,000,000
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers	2,800,000	100,000
Recoverable value added tax credits [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Aggregate balance of recoverable value added tax credits	53,000,000	58,000,000	52,000,000
Valuation allowances	18,000,000	$ 20,000,000	$ 19,000,000
Santa Catarina [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	9,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	9,000,000
Loss contingency amount accrued	0
Santa Catarina [Member] | Minimum [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0
Santa Catarina [Member] | Maximum [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	9,000,000
Parana [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	11,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	3,000,000
Loss contingency amount accrued	0
Parana [Member] | Minimum [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0
Parana [Member] | Maximum [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	$ 3,000,000