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		9 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Schedule of Capitalization, Equity [Line Items]
Total stockholders' equity attributable to parent, beginning balance			$ 1,286,489
Noncontrolling interests in subsidiaries, beginning balance			40,089
Total shareholders' equity, beginning balance			1,326,578	$ 1,453,062	$ 1,453,062
Conversion of Series B 6.75% convertible perpetual preferred stock to common stock			0	107,550
Accrual of stock-based compensation			5,714	4,766
Withholding of shares from stock-based compensation for grantee income taxes (SARs, RSUs, and PSAs)			(2,828)	(2,256)
Dividend equivalents on RSUs			529	503
Net income (loss) attributable to parent	$ 45,400	$ 53,647	75,144	73,435
Net income attributable to noncontrolling interest	4,819	3,415	6,702	2,621
Net (income) loss	50,219	57,062	81,846	76,056
Series B 6.75% convertible perpetual preferred stock dividends declared			0	(11,061)
Common stock dividends declared			(41,051)	(37,787)
Repurchase of stock, retained earnings			(9,849)	0
Dividend equivalents on RSUs			(529)	(503)
Other comprehensive income (loss)			14,313	(18)
Dividends paid to noncontrolling interests			(1,260)	(1,260)
Total stockholders' equity attributable to parent, ending balance	1,324,944	1,441,946	1,324,944	1,441,946	1,286,489
Noncontrolling interest in subsidiaries, ending balance	45,729	39,556	45,729	39,556	40,089
Total shareholders' equity, ending balance	1,370,673	1,481,502	1,370,673	1,481,502	1,326,578
Universal Corporation [Member]
Schedule of Capitalization, Equity [Line Items]
Total stockholders' equity attributable to parent, beginning balance			1,286,489	1,414,222	1,414,222
Conversion of Series B 6.75% convertible perpetual preferred stock to common stock			0	107,550
Accrual of stock-based compensation			5,714	4,766
Withholding of shares from stock-based compensation for grantee income taxes (SARs, RSUs, and PSAs)			(2,828)	(2,256)
Dividend equivalents on RSUs			529	503
Net income (loss) attributable to parent			75,144	73,435
Series B 6.75% convertible perpetual preferred stock dividends declared			0	(11,061)
Common stock dividends declared			(41,051)	(37,787)
Repurchase of stock, retained earnings			(9,849)	0
Dividend equivalents on RSUs			(529)	(503)
Other comprehensive income (loss) attributable to parent			14,115	627
Dividends paid to noncontrolling interests			0	0
Total stockholders' equity attributable to parent, ending balance	1,324,944	1,441,946	1,324,944	1,441,946	1,286,489
Noncontrolling Interests [Member]
Schedule of Capitalization, Equity [Line Items]
Noncontrolling interests in subsidiaries, beginning balance			40,089	38,840	38,840
Conversion of Series B 6.75% convertible perpetual preferred stock to common stock			0	0
Accrual of stock-based compensation			0	0
Withholding of shares from stock-based compensation for grantee income taxes (SARs, RSUs, and PSAs)			0	0
Dividend equivalents on RSUs			0	0
Net income attributable to noncontrolling interest			6,702	2,621
Series B 6.75% convertible perpetual preferred stock dividends declared			0	0
Common stock dividends declared			0	0
Repurchase of stock, retained earnings			0	0
Dividend equivalents on RSUs			0	0
Other comprehensive income (loss) attributable to noncontrolling interest			198	(645)
Dividends paid to noncontrolling interests			(1,260)	(1,260)
Noncontrolling interest in subsidiaries, ending balance	$ 45,729	$ 39,556	45,729	39,556	$ 40,089
Series B Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Non-cash reclassification of preferred stock converted			0	(107,550)
Series B Preferred Stock [Member] | Universal Corporation [Member]
Schedule of Capitalization, Equity [Line Items]
Non-cash reclassification of preferred stock converted			0	(107,550)
Series B Preferred Stock [Member] | Noncontrolling Interests [Member]
Schedule of Capitalization, Equity [Line Items]
Non-cash reclassification of preferred stock converted			0	0
Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Repurchase of common stock			2,790	0
Common Stock [Member] | Universal Corporation [Member]
Schedule of Capitalization, Equity [Line Items]
Repurchase of common stock			2,790	0
Common Stock [Member] | Noncontrolling Interests [Member]
Schedule of Capitalization, Equity [Line Items]
Repurchase of common stock			$ 0	$ 0