Nature Of Operations And Significant Accounting Policies (Narrative) (Details)		12 Months Ended
		Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 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]	$ 3,922,000	$ 7,517,000	$ 5,541,000
Payments to Noncontrolling Interests				600,000
Advances to suppliers, current and non-current		153,000,000	129,000,000
Valuation allowance amount related to advances to suppliers		16,000,000	18,000,000
Provision (recoveries) for loss on uncollectible advances to suppliers		1,000,000.0	(2,300,000)	3,700,000
Advances to suppliers on which interest has been discontinued		5,000,000	6,000,000
Aggregate balance of recoverable value added tax credits		52,000,000	53,000,000
Valuation allowance on recoverable value added tax credits		19,000,000	17,000,000
Interest costs capitalized		0	0	0
Foreign currency remeasurement gain (loss)		16,400,000	1,800,000	(200,000)
Foreign currency transaction gain (loss)		$ 2,900,000	4,300,000	100,000
Percentage of revenue earned from processing tobacco owned by customers		5.00%
Adoption of FASB Accounting Standards Update			(1,934,000)	0
Operating lease right-of-use assets		$ 39,256,000	0
Operating Lease, Liability		35,716,000
Accounting Standards Update 2018-02 [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Adoption of FASB Accounting Standards Update				12,400,000
Accounting Standards Update 2016-16 [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Adoption of FASB Accounting Standards Update		(1,900,000)
Accounting Standards Update 2016-02 [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Operating lease right-of-use assets		36,600,000
Operating Lease, Liability		34,200,000
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		12 years
AOCI Attributable to Parent [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Adoption of FASB Accounting Standards Update				(12,373,000)
Retained Earnings [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]
Adoption of FASB Accounting Standards Update			$ (1,934,000)	$ 12,373,000

[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.