Restructuring costs (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs				$ 1,122	$ 10,573
Restructuring and impairment costs	[1]	$ 0	$ 10,573	1,122	10,573
Tobacco Operations
Restructuring Cost and Reserve [Line Items]
Property, plant and equipment impairment charges				1,000
Restructuring and impairment costs				$ 100	100
Tobacco Operations | GERMANY
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					$ 10,500

[1] Restructuring and impairment costs are excluded from segment operating income, but are included in consolidated operating income in the consolidated statements of income and comprehensive income. See Note 2 for additional information.