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Transfer of Financial Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Installment loans ¥ 795,328 ¥ 905,218 ¥ 1,317,496
Gain (losses) on sale from securitization and loan sales ¥ 14,622 ¥ 18,462 ¥ 34,301