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Revenue from Contracts with Customers Revenue from Contract with Customers (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Five largest customers [Member]
Revenues	$ 0.60
Philip Morris International Inc [Member]
Revenues	480,000,000	$ 630,000,000	$ 460,000,000
Imperial Tobacco Group Plc [Member]
Revenues	370,000,000	340,000,000	430,000,000
Japanese Tobacco, Inc [Member]
Revenues	$ 280,000,000	$ 210,000,000	$ 200,000,000

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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