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Equity Method Investments - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Investment in affiliates, aggregate investment	¥ 107,524	¥ 163,074
Investment in affiliates, market value	107,466	157,932
Investment in affiliates, dividends received	30,151	25,820	¥ 25,574
Investment in affiliates over underlying equity in net assets	¥ 127,779	¥ 144,709
Kansai Airports
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%	40.00%
ORIX Credit Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	34.00%	34.00%
Avolon Holdings
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	30.00%	30.00%

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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