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Guarantees, Other Contingent Liabilities, And Other Matters (Details)
 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Sep. 09, 2011
Italy [Member]
USD ($)
Sep. 09, 2011
Italy [Member]
EUR (€)
Nov. 15, 2005
Italy [Member]
EUR (€)
Jun. 30, 2012
Italy [Member]
Deltafina's [Member]
Jun. 30, 2011
Cummulative fifteen month proceeds [Member]
USD ($)
Loss Contingencies [Line Items]                  
Company total exposure under guarantees $ 3,000,000                
Guarantee face amount including unpaid accrued interest 5,000,000 39,000,000 26,000,000            
Fair value of the guarantees 2,000,000 14,000,000 6,000,000            
Other contingent liabilities 4,000,000                
Charge recorded to accrue European Commission fines         49,100,000        
Fines imposed by European Commission           30,000,000 30,000,000    
Accumulated interest on European Commission fine           5,900,000      
Expected resolution time for appeal, years               2  
Advances to suppliers current and noncurrent 155,000,000 227,000,000 225,000,000            
Valuation allowance amount related to advances to suppliers 67,000,000 83,000,000 74,000,000            
Provision for loss on uncollectible advances to suppliers 1,000,000 4,000,000              
Aggregate balance of recoverable value added tax credits 77,000,000 85,000,000 82,000,000            
Valuation allowance on recoverable value added tax credits 25,000,000 25,000,000 25,000,000            
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 24,000,000                
Reduction of Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 18,000,000                
Proceeds from insurance settlement, investing activities 0 9,933,000              
Gain on property and equipment fire loss insurance settlement 0 9,592,000              
Gain on business interruption insurance settlement   2,100,000   4,800,000         6,900,000
Reversal of statutory severance liability due to law change in Malawi   $ 4,000,000