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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 | ¥ 2,756,904 | ¥ 2,610,484
Net Income | ¥ 294,352 | ¥ 322,756

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