Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Assets:
Money market funds	$ 1,622	$ 137,145	$ 136,879
Trading securities associated with deferred compensation plans	17,386	17,726	17,310
Interest rate swap agreements	1,640	2,149
Forward foreign currency exchange contracts	394	973	140
Total financial assets measured and reported at fair value	21,042	157,993	154,329
Liabilities:
Guarantees of bank loans to tobacco growers	970	1,177	1,722
Interest rate swap agreements			11,010
Forward foreign currency exchange contracts	248	175	1,554
Total financial liabilities measured and reported at fair value	1,218	1,352	14,286
Net Asset Value (NAV) [Member]
Assets:
Money market funds	1,622	137,145	136,879
Trading securities associated with deferred compensation plans	0	0	0
Interest rate swap agreements	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	1,622	137,145	136,879
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements			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	17,386	17,726	17,310
Interest rate swap agreements	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	17,386	17,726	17,310
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements			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
Interest rate swap agreements	1,640	2,149
Forward foreign currency exchange contracts	394	973	140
Total financial assets measured and reported at fair value	2,034	3,122	140
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements			11,010
Forward foreign currency exchange contracts	248	175	1,554
Total financial liabilities measured and reported at fair value	248	175	12,564
Level 3 [Member]
Assets:
Money market funds	0	0	0
Trading securities associated with deferred compensation plans	0	0	0
Interest rate swap agreements	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	970	1,177	1,722
Interest rate swap agreements			0
Forward foreign currency exchange contracts	0	0	0
Total financial liabilities measured and reported at fair value	$ 970	$ 1,177	$ 1,722