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Revenue from Contract with Customer Revenue from Contract with Customer (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 537,546 $ 487,170 $ 912,516 $ 766,481
Other operating sales and revenues 2,058 1,078 6,807 6,389
Sales and other operating revenues 539,604 488,248 919,323 772,870
Tobacco sales [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 509,632 459,569 854,769 716,790
Processing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 17,394 17,275 39,101 30,629
Other sales and revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 10,520 $ 10,326 $ 18,646 $ 19,062