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Acquisitions and Divestitures - Operations of the Company and its Subsidiaries (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Business Acquisition, Pro Forma Information [Abstract] |  |
Total revenues | ¥ 2,754,190 | ¥ 2,598,161
Net Income | ¥ 310,937 | ¥ 327,997

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