Commitments And Other Matters (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Commitments And Other Matters [Line Items]
Total amount of advances funded towards tobacco purchase	$ 123,000,000	$ 123,000,000
Commitments relating to agricultural materials,capital expenditures	52,000,000	52,000,000
Face amount of guarantee including unpaid accrued interest	20,000,000	20,000,000	$ 17,000,000
Fair value of the guarantees	1,000,000	1,000,000	1,000,000
Other contingent liabilities	$ 2,000,000	2,000,000
Crop supply agreement, term	2 years
Unfair benefit from green tobacco purchase contract		$ 105,000
Due period of accounts receivables		30
Allowance for doubtful accounts	$ 2,000,000	$ 2,000,000	4,000,000
Payments to Acquire Businesses, Net of Cash Acquired		0	0	$ 5,964,000
Fair value gain upon acquisition of partner's interest in joint venture		0	0	3,390,000
Fair value of assets upon acquisition of partner's interest in joint venture			12,000,000
The Company and subsidiary [Member]
Commitments And Other Matters [Line Items]
Fines imposed by FCC		197,000,000
The customer and subsidiary [Member]
Commitments And Other Matters [Line Items]
Fines imposed by FCC		1,000,000,000
Cooperatives under contract [Member]
Commitments And Other Matters [Line Items]
Growers cooperative		4
Total Cooperatives [Member]
Commitments And Other Matters [Line Items]
Growers cooperative		400
Philip Morris International, Inc [Member]
Commitments And Other Matters [Line Items]
Revenues from customers		520,000,000	590,000,000	640,000,000
Imperial Tobacco Group, PLC [Member]
Commitments And Other Matters [Line Items]
Revenues from customers		270,000,000	230,000,000	210,000,000
British American Tobacco plc [Member]
Commitments And Other Matters [Line Items]
Revenues from customers		230,000,000	$ 220,000,000	$ 230,000,000
Six largest customers revenue percentage [Member]
Commitments And Other Matters [Line Items]
Revenues from customers		0.70
Santa Catarina [Member]
Commitments And Other Matters [Line Items]
Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits	14,000,000	14,000,000
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits		15,000,000
Santa Catarina [Member] | Minimum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0	0
Santa Catarina [Member] | Maximum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	15,000,000	15,000,000
Parana [Member]
Commitments And Other Matters [Line Items]
Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits	17,000,000	17,000,000
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits		5,000,000
Parana [Member] | Minimum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0	0
Parana [Member] | Maximum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	$ 5,000,000	5,000,000
Next Fiscal Year [Member]
Commitments And Other Matters [Line Items]
Tobacco purchase contracts		644,000,000
After Next Fiscal Year [Member]
Commitments And Other Matters [Line Items]
Tobacco purchase contracts		$ 114,000,000