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Transfer of Financial Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Gain (losses) on sale from securitization and loan sales ¥ 20,635 ¥ 16,342 ¥ 12,702
Installment Loans      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Installment loans ¥ 643,422 ¥ 475,904 ¥ 394,688