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Commitments And Other Matters (Narrative) (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Commitments And Other Matters [Line Items]        
Total amount of advances funded towards tobacco purchase   $ 102,000,000    
Commitments relating to agricultural materials,capital expenditures   53,000,000    
Company total exposure under guarantees   11,000,000    
Face amount of guarantee including unpaid accrued interest   13,000,000 $ 17,000,000  
Fair value of the guarantees   2,000,000 2,000,000  
Other contingent liabilities   $ 2,000,000    
Due period of accounts receivables   30    
Allowance for doubtful accounts   $ 9,000,000 5,000,000  
Total Amount of Brazilian IPI Federal Tax Credits Made Available by Court Decision $ 104,000,000      
Gain on settlement of excise tax case 81,600,000 0 12,676,000 $ 81,619,000
Gain on favorable outcome of excise tax case in Brazil, after tax $ 53,100,000      
Diluted earnings per share calculation based on gain from excise tax case in Brazil | $ / shares $ 1.87      
Net book value on tax credits from excise tax case after valuation allowance $ 90,000,000 12,700,000    
Payments to Acquire Businesses, Net of Cash Acquired   5,964,000 0 0
Fair value gain upon acquisition of partner's interest in joint venture   3,390,000 0 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   640,000,000 580,000,000 590,000,000
British American Tobacco PLC [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers   230,000,000 220,000,000 240,000,000
Imperial Tobacco Group, PLC [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers   210,000,000 $ 280,000,000 $ 340,000,000
Five largest customers revenue percentage [Member]        
Commitments And Other Matters [Line Items]        
Revenues from customers   0.60    
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    
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits   12,000,000    
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   12,000,000    
Parana [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   5,000,000    
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   5,000,000    
Fiscal Year 2017 [Member]        
Commitments And Other Matters [Line Items]        
Tobacco purchase contracts   566,000,000    
After Fiscal Year 2017 [Member]        
Commitments And Other Matters [Line Items]        
Tobacco purchase contracts   $ 110,000,000