Other Contingent Liabilities And Other Matters (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021
Other Contingent Liabilities and Other Matters [Line Items]
Other contingent liabilities	$ 1,000
Net provision for losses (recoveries) on advances to suppliers	(328)	$ 57
Long-term Line of Credit	150,000
Loans Payable	150,000
Stock repurchase program authorized amount	100,000
Stock repurchase program remaining authorized repurchase amount	100,000
Five-year term loan [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Issuance of long-term debt	75,000
Loans Payable	225,000
Seven-year term loan [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Issuance of long-term debt	75,000
Loans Payable	295,000
Advances to suppliers [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Advances to suppliers current and non-current	92,000	83,000	$ 144,000
Valuation allowances	18,000	16,000	18,000
Net provision for losses (recoveries) on advances to suppliers	(300)	100
Recoverable value added tax credits [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Aggregate balance of recoverable value added tax credits	61,000	54,000	49,000
Valuation allowances	19,000	$ 17,000	$ 19,000
Santa Catarina [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	9,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	9,000
Loss contingency amount accrued	0
Santa Catarina [Member] | Minimum [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0
Santa Catarina [Member] | Maximum [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	9,000
Parana [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	11,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	3,000
Loss contingency amount accrued	0
Parana [Member] | Minimum [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0
Parana [Member] | Maximum [Member]
Other Contingent Liabilities and Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	$ 3,000