Operating Segments (Operating Results For The Company's Reportable Segments) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 671,723	$ 636,107	$ 539,604	$ 379,719	$ 607,496	$ 653,581	$ 488,248	$ 284,622	$ 2,227,153	$ 2,033,947	$ 2,071,218
Operating Income										161,169	170,825	178,401
Equity in pretax earnings of unconsolidated affiliates	[1]									(5,299)	(9,125)	(5,774)
Restructuring and impairment costs	[2]									(20,304)	0	(4,359)
Segment Assets		2,133,184				2,168,632				2,133,184	2,168,632	2,123,405
Goodwill		97,907				98,807				97,907	98,807	98,803
Depreciation and Amortization										37,150	34,893	35,970
Capital Expenditures										38,760	34,037	35,630
Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues										2,227,153	2,033,947	2,071,218
Operating Income										186,772	179,950	188,534
Flue-Cured And Burley Leaf Tobacco Operations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues										1,952,369	1,790,879	1,839,429
Operating Income										174,596	169,852	178,515
Segment Assets		1,767,164				1,829,633				1,767,164	1,829,633	1,822,515
Goodwill		96,194				97,094				96,194	97,094	97,159
Depreciation and Amortization										28,844	29,319	30,732
Capital Expenditures										25,706	25,136	25,821
Flue-Cured And Burley Leaf Tobacco Operations [Member] | North America [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues										382,631	308,691	416,438
Operating Income										23,069	23,091	35,221
Segment Assets		294,064				368,672				294,064	368,672	357,406
Goodwill		0				0				0	0	0
Depreciation and Amortization										4,756	4,772	4,626
Capital Expenditures										3,137	3,316	4,202
Flue-Cured And Burley Leaf Tobacco Operations [Member] | Other Regions [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	[3]									1,569,738	1,482,188	1,422,991
Operating Income	[3]									151,527	146,761	143,294
Segment Assets	[3]	1,473,100				1,460,961				1,473,100	1,460,961	1,465,109
Goodwill	[3]	96,194				97,094				96,194	97,094	97,159
Depreciation and Amortization	[3]									24,088	24,547	26,106
Capital Expenditures	[3]									22,569	21,820	21,619
Other Tobacco Operations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	[4]									274,784	243,068	231,789
Operating Income	[4]									12,176	10,098	10,019
Segment Assets	[4]	366,020				338,999				366,020	338,999	300,890
Goodwill	[4]	$ 1,713				$ 1,713				1,713	1,713	1,644
Depreciation and Amortization	[4]									8,306	5,574	5,238
Capital Expenditures	[4]									$ 13,054	$ 8,901	$ 9,809

[1] Equity in pretax earnings of unconsolidated affiliates is included in segment operating income (Other Tobacco Operations segment), but is reported below consolidated operating income and excluded from that total in the consolidated statements of income.

[2] Restructuring and impairment costs are excluded from segment operating income, but are included in consolidated operating income in the consolidated statements of income (see Note 3)

[3] Includes South America, Africa, Europe, and Asia regions, as well as inter-region eliminations.

[4] Includes Dark Air-Cured, Oriental, and Special Services, as well as intercompany eliminations. Sales and other operating revenues, goodwill, depreciation and amortization, and capital expenditures include limited amounts or no amounts for Oriental because the business is accounted for on the equity method and its financial results consist principally of equity in the pretax earnings of the unconsolidated affiliate. The investment in the unconsolidated affiliate is included in segment assets and was approximately $79.2 million, $89.3 million, and $78.1 million, at March 31, 2019, 2018, and 2017, respectively.