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Transfer of Financial Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Transfer of Financial Assets Accounted for as Sales [Line Items]        
Installment loans ¥ 256,753 ¥ 285,760 ¥ 471,119 ¥ 512,156
Gain (losses) on sale from securitization and loan sales ¥ 4,613 ¥ 5,744 ¥ 9,215 ¥ 11,156