Revenue from Contract with Customer (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 376,348	$ 474,513	$ 691,748	$ 770,414
Other operating sales and revenues	677	1,408	1,088	2,422
Sales and other operating revenues	377,025	475,921	692,836	772,836
Tobacco sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	334,545	449,431	609,687	717,488
Processing revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,474	16,701	28,774	35,135
Other sales and revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 29,329	$ 8,381	$ 53,287	$ 17,791