Nature Of Operations And Significant Accounting Policies (Narrative) (Details)		12 Months Ended
		Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Nature Of Operations And Significant Accounting Policies [Line Items]
Number of countries in which entity operates		30
Dividends received on equity method investments	[1]	$ (5,541,000)	$ (5,078,000)	$ (3,422,000)
Advances to suppliers, current and non-current		150,000,000	134,000,000
Valuation allowance amount related to advances to suppliers		22,000,000	27,000,000
Provision (recoveries) for loss on uncollectible advances to suppliers		3,700,000	(900,000)	800,000
Advances to suppliers on which interest has been discontinued		8,000,000	11,000,000
Aggregate balance of recoverable value added tax credits		49,000,000	45,000,000
Valuation allowance on recoverable value added tax credits		15,000,000	13,000,000
Interest costs capitalized		0	0	0
Amount charged for goodwill impairment		0	0	0
Impairment of property, plant and equipment		0	2,300,000	0
Foreign currency remeasurement gain (loss)		(200,000)	9,300,000	22,500,000
Foreign currency transaction gain (loss)		$ 100,000	1,300,000	$ (8,000,000)
Percentage of revenue earned from processing tobacco owned by customers		5.00%
Payments to Noncontrolling Interests		$ 600,000
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
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] | 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
Accounting Standards Update 2015-03 [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Unamortized Debt Issuance Expense			$ 2,000,000

[1] (1) In accordance with the applicable accounting guidance, dividends received from unconsolidated affiliates accounted for on the equity method that represent a return on capital (i.e., a return of earnings on a cumulative basis) are presented as operating cash flows in the consolidated statements of cash flows.