Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Assets:
Money market funds	$ 1,708	$ 89,767	$ 1,622
Trading securities associated with deferred compensation plans	17,344	17,519	17,386
Interest rate swap agreements	10,205	8,262	1,640
Forward foreign currency exchange contracts	142	360	394
Total financial assets measured and reported at fair value	29,399	115,908	21,042
Liabilities:
Guarantees of bank loans to tobacco growers	919	974	970
Forward foreign currency exchange contracts	384	392	248
Total financial liabilities measured and reported at fair value	1,303	1,366	1,218
Net Asset Value [Member]
Assets:
Money market funds	1,708	89,767	1,622
Trading securities associated with deferred compensation plans	0	0	0
Interest rate swap agreements	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	1,708	89,767	1,622
Liabilities:
Guarantees of bank loans to tobacco growers	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	17,344	17,519	17,386
Interest rate swap agreements	0	0	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	17,344	17,519	17,386
Liabilities:
Guarantees of bank loans to tobacco growers	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
Interest rate swap agreements	10,205	8,262	1,640
Forward foreign currency exchange contracts	142	360	394
Total financial assets measured and reported at fair value	10,347	8,622	2,034
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Forward foreign currency exchange contracts	384	392	248
Total financial liabilities measured and reported at fair value	384	392	248
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	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	919	974	970
Forward foreign currency exchange contracts	0	0	0
Total financial liabilities measured and reported at fair value	$ 919	$ 974	$ 970