Equity Method Investments - Summary (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Operations statement:
Gross profit	$ 19,626	$ 39,712
Net income	(92,809)	(62,163)
Balance sheet:
Current assets	1,277,250	1,290,822	$ 1,232,368
Current liabilities	1,165,175	783,755	789,066
Equity Method Investment
Operations statement:
Sales	35,711	46,233
Gross profit	6,949	9,507
Net income	2,309	3,100
Company's dividends received	5,064	6,094
Balance sheet:
Current assets	232,176	236,389	145,207
Property, plant, and equipment and other assets	50,679	55,023	56,481
Current liabilities	174,367	184,526	82,377
Long-term obligations and other liabilities	$ 6,107	3,354	$ 6,296
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	$ 5,189
China Brasil Tobacos Exportadora SA | Equity Method Investment
Operations statement:
Sales	14,328	18,391
Gross profit	2,148	2,212
Net income	915	(35)
Net income (loss) attributable to CBT	$ 448	$ (17)
Nicotine River, LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment (as a percent)	40.00%
Basis difference	$ 1,778
Oryantal Tütün Paketleme Sanayi ve Ticaret A.Ş.
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