Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($)	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Face amount of guarantee including unpaid accrued interest	$ 5,000,000	$ 29,000,000	$ 17,000,000
Fair value of the guarantees	137,000	919,000	803,000
Other contingent liabilities	$ 1,000,000
Crops supply agreement, term	2 years
Unfair benefit from green tobacco purchase contract	$ 105,000
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers	(1,885,000)	(5,408,000)
Stock repurchase program authorized amount	100,000,000
Stock repurchase program remaining authorized repurchase amount	77,200,000
Advances to suppliers [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Advances to suppliers current and non-current	94,000,000	73,000,000	129,000,000
Valuation allowances	16,000,000	16,000,000	18,000,000
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers	(1,900,000)	(5,400,000)
Recoverable value added tax credits [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Aggregate balance of recoverable value added tax credits	56,000,000	54,000,000	53,000,000
Valuation allowances	20,000,000	$ 17,000,000	$ 17,000,000
Pending Litigation [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Loss contingency amount accrued	0
The Company and subsidiary [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Loss contingency amount accrued	0
Fines imposed by FCC	197,000,000
The customer and subsidiary [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Fines imposed by FCC	1,000,000,000
Cooperatives under contract [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Growers cooperative	4
Total Cooperatives [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Growers cooperative	400
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	11,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	11,000,000
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	11,000,000
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	13,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	5,000,000
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	$ 5,000,000