Changes In Shareholders' Equity And Noncontrolling Interests In Subsidiaries (Reconciliation Of Changes In Shareholders' Equity And Noncontrolling Interests In Subsidiaries) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Capitalization, Equity [Line Items]
Total stockholders' equity attributable to parent, beginning balance			$ 1,342,429
Noncontrolling interests in subsidiaries, beginning balance			42,873
Total shareholders' equity, beginning balance			1,385,302	$ 1,326,578
Accrual of stock-based compensation			5,750	4,181
Withholding of shares from stock-based compensation for grantee income taxes (RSUs, and PSAs)			(2,657)	(2,828)
Dividend equivalents on RSUs			371	351
Net income (loss) attributable to parent	$ 31,446	$ 26,167	44,625	29,744
Net income attributable to noncontrolling interest	2,847	2,139	728	1,883
Net (income) loss	34,293	28,306	45,353	31,627
Common stock dividends declared			(37,445)	(27,238)
Repurchase of stock, retained earnings			(1,046)	(9,849)
Dividend equivalents on RSUs			(371)	(351)
Adoption of FASB Accounting Standards Update 2016-16 eliminating deferred income taxes on unrecognized gains on intra-entity transfers of assets other than inventory			(1,934)	0
Other comprehensive income (loss)			(13,248)	10,561
Dividends paid to noncontrolling interests			(1,260)	(1,260)
Total stockholders' equity attributable to parent, ending balance	1,336,341	1,288,381	1,336,341	1,288,381
Noncontrolling interest in subsidiaries, ending balance	42,077	40,601	42,077	40,601
Total shareholders' equity, ending balance	1,378,418	1,328,982	1,378,418	1,328,982
Universal Corporation [Member]
Schedule of Capitalization, Equity [Line Items]
Total stockholders' equity attributable to parent, beginning balance			1,342,429	1,286,489
Accrual of stock-based compensation			5,750	4,181
Withholding of shares from stock-based compensation for grantee income taxes (RSUs, and PSAs)			(2,657)	(2,828)
Dividend equivalents on RSUs			371	351
Net income (loss) attributable to parent			44,625	29,744
Common stock dividends declared			(37,445)	(27,238)
Repurchase of stock, retained earnings			(1,046)	(9,849)
Dividend equivalents on RSUs			(371)	(351)
Adoption of FASB Accounting Standards Update 2016-16 eliminating deferred income taxes on unrecognized gains on intra-entity transfers of assets other than inventory			(1,934)	0
Other comprehensive income (loss) attributable to parent			(12,984)	10,672
Dividends paid to noncontrolling interests			0	0
Total stockholders' equity attributable to parent, ending balance	1,336,341	1,288,381	1,336,341	1,288,381
Noncontrolling Interests [Member]
Schedule of Capitalization, Equity [Line Items]
Noncontrolling interests in subsidiaries, beginning balance			42,873	40,089
Accrual of stock-based compensation			0	0
Withholding of shares from stock-based compensation for grantee income taxes (RSUs, and PSAs)			0	0
Dividend equivalents on RSUs			0	0
Net income attributable to noncontrolling interest			728	1,883
Common stock dividends declared			0	0
Repurchase of stock, retained earnings			0	0
Dividend equivalents on RSUs			0	0
Adoption of FASB Accounting Standards Update 2016-16 eliminating deferred income taxes on unrecognized gains on intra-entity transfers of assets other than inventory			0	0
Other comprehensive income (loss) attributable to noncontrolling interest			(264)	(111)
Dividends paid to noncontrolling interests			(1,260)	(1,260)
Noncontrolling interest in subsidiaries, ending balance	$ 42,077	$ 40,601	42,077	40,601
Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Repurchase of common stock			(397)	(2,790)
Common Stock [Member] | Universal Corporation [Member]
Schedule of Capitalization, Equity [Line Items]
Repurchase of common stock			(397)	(2,790)
Common Stock [Member] | Noncontrolling Interests [Member]
Schedule of Capitalization, Equity [Line Items]
Repurchase of common stock			$ 0	$ 0