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ORIX Corporation Shareholders' Equity (Changes in Number of Shares Issued) (Detail) - shares
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Uncategorized [Abstract]      
Beginning balance 1,234,849,342 1,258,277,087 1,285,724,480
Cancellation of treasury stock (19,888,288) (23,427,745) (27,447,393)
Ending balance 1,214,961,054 1,234,849,342 1,258,277,087