Nature Of Operations And Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Nature Of Operations And Significant Accounting Policies [Line Items]
Number of countries in which entity operates		30
Dividends received on equity method investments		$ 0	$ 16,700,000	$ 0
Advances to suppliers, current and non-current		199,100,000	225,000,000
Valuation allowance amount related to advances to suppliers		54,400,000	74,400,000
Provision for loss on uncollectible advances to suppliers		1,600,000	11,900,000	18,700,000
Advances to suppliers on which interest has been discontinued		40,000,000	59,900,000
Aggregate balance of recoverable value added tax credits		73,000,000	82,000,000
Valuation allowance on recoverable value added tax credits		26,000,000	25,000,000
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits		24,000,000
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits		17,000,000
Goodwill, written off related to sale of business unit	5,800,000
Impairment of property, plant and equipment		0	0
Foreign currency remeasurement gain (loss)		10,600,000	(2,300,000)	4,400,000
Foreign currency transaction gain (loss)		(1,000,000)	4,200,000	1,700,000
Percentage of revenue earned from processing tobacco owned by customers		5.00%
Goodwill, Impairment Loss		0	0	0
Interest Costs Capitalized		0	0	0
Zimbabwe [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Investment in deconsolidated subsidiary		0	0
Net foreign currency translation loss		7,200,000
Canadian Operations [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Impairment of property, plant and equipment	5,600,000
Minimum [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits		0
Minimum [Member] | Buildings [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		15 years
Minimum [Member] | Processing And Packing Machinery [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Minimum [Member] | Transport Equipment [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Minimum [Member] | Computer Equipment [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Maximum [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits		$ 17,000,000
Maximum [Member] | Buildings [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		40 years
Maximum [Member] | Processing And Packing Machinery [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		11 years
Maximum [Member] | Transport Equipment [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		10 years
Maximum [Member] | Computer Equipment [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Estimated useful life		10 years