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Commitments And Other Matters (Narrative) (Details)
 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2013
USD ($)
Commitments And Other Matters [Line Items]        
Total amount of advances funded towards tobacco purchase $ 104,000,000      
Commitments relating to agricultural materials,capital expenditures 48,000,000      
Face amount of guarantee including unpaid accrued interest 17,000,000 $ 13,000,000    
Fair value of the guarantees 1,000,000 2,000,000    
Other contingent liabilities $ 2,000,000      
Due period of accounts receivables 30      
Allowance for doubtful accounts $ 4,000,000 9,000,000    
Total Amount of Brazilian IPI Federal Tax Credits Made Available by Court Decision       $ 104,000,000
Net book value on tax credits from excise tax case after valuation allowance     $ 12,700,000  
Payments to Acquire Businesses, Net of Cash Acquired 0 5,964,000 0  
Fair value gain upon acquisition of partner's interest in joint venture 0 3,390,000 0  
Fair value of assets upon acquisition of partner's interest in joint venture   12,000,000    
Philip Morris International, Inc [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers 590,000,000 640,000,000 580,000,000  
British American Tobacco plc [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers 220,000,000 230,000,000 220,000,000  
Imperial Tobacco Group, PLC [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers 230,000,000 $ 210,000,000 $ 280,000,000  
Five largest customers revenue percentage [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers 0.65      
Santa Catarina [Member]        
Commitments And Other Matters [Line Items]        
Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits 15,000,000      
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      
Santa Catarina [Member] | Maximum [Member]        
Commitments And Other Matters [Line Items]        
Estimate of possible loss on remaining VAT audit assessment 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 18,000,000      
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits 6,000,000      
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 6,000,000      
Fiscal Year 2018 [Member]        
Commitments And Other Matters [Line Items]        
Tobacco purchase contracts 622,000,000      
After Fiscal Year 2018 [Member]        
Commitments And Other Matters [Line Items]        
Tobacco purchase contracts $ 68,000,000