Investee Companies - Summary (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Operations Statement Information
Sales	$ 46,233	$ 47,226
Gross profit	9,507	7,767
Net income	3,100	2,044
Company's dividends received	6,094	0
Balance Sheet Information
Current assets	236,389	235,004	$ 152,661
Property, plant, and equipment and other assets	55,023	50,618	53,103
Current liabilities	184,526	172,263	89,791
Long-term obligations and other liabilities	$ 3,354	4,622	$ 3,222
Adams International Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	49.00%
Basis difference	$ 0
Alliance One Industries India Private Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	49.00%
Basis difference	$ 0
China Brasil Tobacos Exportadora SA
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	49.00%
Basis difference	$ 6,707
Operations Statement Information
Sales	18,391	23,235
Gross profit	2,212	3,605
Net income	(35)	780
Net (loss) income attributable to the investee	$ (17)	$ 382
Criticality LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	40.00%
Basis difference	$ 913
Nicotine River, LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	40.00%
Basis difference	$ 2,026
Oryantal Tutun Paketleme
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	50.00%
Basis difference	$ 0
Purilum, LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	50.00%
Basis difference	$ 0
Siam Tobacco Export Company
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	49.00%
Basis difference	$ 0