Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($)	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Face amount of guarantee including unpaid accrued interest	$ 29,000,000	$ 31,000,000	$ 20,000,000
Fair value of the guarantees	919,000	970,000	974,000
Other contingent liabilities	$ 2,000,000
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	(5,408,000)	937,000
Advances to suppliers [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Advances to suppliers current and non-current	73,000,000	91,000,000	150,000,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	16,000,000	22,000,000	22,000,000
Recoverable value added tax credits [Member]
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]
Aggregate balance of recoverable value added tax credits	54,000,000	53,000,000	49,000,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	17,000,000	$ 17,000,000	$ 15,000,000
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	12,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	13,000,000
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	13,000,000
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	14,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits	4,000,000
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	$ 4,000,000