Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets:
Money market funds	$ 241,991	$ 116,618	$ 26,578
Trading securities associated with deferred compensation plans	17,210	17,817	18,907
Interest Rate Derivative Assets, at Fair Value	853
Forward foreign currency exchange contracts	4	772	540
Total financial assets measured and reported at fair value	260,058	135,207	46,025
Liabilities:
Guarantees of bank loans to tobacco growers	1,844	1,628	1,469
Interest rate swap agreements		10,766	1,573
Forward foreign currency exchange contracts	1,229	5	90
Total financial liabilities measured and reported at fair value	3,073	12,399	3,132
Net Asset Value (NAV) [Member]
Assets:
Money market funds	241,991	116,618	26,578
Trading securities associated with deferred compensation plans	0	0	0
Interest Rate Derivative Assets, at Fair Value	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	241,991	116,618	26,578
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements		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	17,210	17,817	18,907
Interest Rate Derivative Assets, at Fair Value	0
Forward foreign currency exchange contracts	0	0	0
Total financial assets measured and reported at fair value	17,210	17,817	18,907
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements		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 Derivative Assets, at Fair Value	853
Forward foreign currency exchange contracts	4	772	540
Total financial assets measured and reported at fair value	857	772	540
Liabilities:
Guarantees of bank loans to tobacco growers	0	0	0
Interest rate swap agreements		10,766	1,573
Forward foreign currency exchange contracts	1,229	5	90
Total financial liabilities measured and reported at fair value	1,229	10,771	1,663
Level 3 [Member]
Assets:
Money market funds	0	0	0
Trading securities associated with deferred compensation plans	0	0	0
Interest Rate Derivative Assets, at Fair Value	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	1,844	1,628	1,469
Interest rate swap agreements		0	0
Forward foreign currency exchange contracts	0	0	0
Total financial liabilities measured and reported at fair value	$ 1,844	$ 1,628	$ 1,469