Commitments And Other Matters (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Commitments And Other Matters [Line Items]
Total amount of advances funded towards tobacco purchase	$ 134,000,000
Commitments relating to agricultural materials,capital expenditures	52,000,000
Face amount of guarantee including unpaid accrued interest	3,000,000	$ 17,000,000
Fair value of the guarantees	100,000	$ 1,000,000.0
Other contingent liabilities	$ 1,000,000
Crop supply agreement, term	2 years
The Company and subsidiary [Member]
Commitments And Other Matters [Line Items]
Unfair benefit from green tobacco purchase contract	$ 105,000
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
Santa Catarina [Member]
Commitments And Other Matters [Line Items]
Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits	8,000,000
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits	9,000,000
Santa Catarina [Member] | Minimum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0
Santa Catarina [Member] | Maximum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	9,000,000
Parana [Member]
Commitments And Other Matters [Line Items]
Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits	11,000,000
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits	3,000,000
Parana [Member] | Minimum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	0
Parana [Member] | Maximum [Member]
Commitments And Other Matters [Line Items]
Estimate of possible loss on remaining VAT audit assessment	3,000,000
Next Fiscal Year [Member]
Commitments And Other Matters [Line Items]
Tobacco purchase contracts	378,000,000
After Next Fiscal Year [Member]
Commitments And Other Matters [Line Items]
Tobacco purchase contracts	$ 88,000,000