Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015
Assets:
Money market funds	$ 136,879	$ 116,618	$ 1,574
Trading securities associated with deferred compensation plans	17,310	17,817	18,359
Forward foreign currency exchange contracts	140	772	4,354
Total financial assets measured and reported at fair value	154,329	135,207	24,287
Liabilities:
Guarantees of bank loans to tobacco growers	1,722	1,628	1,356
Interest rate swap agreements	11,010	10,766	6,430
Forward foreign currency exchange contracts	1,554	5	13
Total financial liabilities measured and reported at fair value	14,286	12,399	7,799
Net Asset Value (NAV) [Member]
Assets:
Money market funds	136,879	116,618	1,574
Trading securities associated with deferred compensation plans	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	136,879	116,618	1,574
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial liabilities measured and reported at fair value	0	0	0
Level 1 [Member]
Assets:
Money market funds	0	0	0
Trading securities associated with deferred compensation plans	17,310	17,817	18,359
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	17,310	17,817	18,359
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial liabilities measured and reported at fair value	0	0	0
Level 2 [Member]
Assets:
Money market funds	0	0	0
Trading securities associated with deferred compensation plans	0	0	0
Forward foreign currency exchange contracts	140	772	4,354
Total financial assets measured and reported at fair value	140	772	4,354
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements	11,010	10,766	6,430
Forward foreign currency exchange contracts	1,554	5	13
Total financial liabilities measured and reported at fair value	12,564	10,771	6,443
Level 3 [Member]
Assets:
Money market funds	0	0	0
Trading securities associated with deferred compensation plans	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	0	0	0
Liabilities:
Guarantees of bank loans to tobacco growers	1,722	1,628	1,356
Interest rate swap agreements	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial liabilities measured and reported at fair value	$ 1,722	$ 1,628	$ 1,356