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Transfer of Financial Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Transfer of Financial Assets Accounted for as Sales [Line Items]        
Gain (losses) on sale from securitization and loan sales ¥ 3,675 ¥ 4,110 ¥ 13,378 ¥ 12,122
Installment Loans        
Transfer of Financial Assets Accounted for as Sales [Line Items]        
Installment loans ¥ 154,890 ¥ 152,310 ¥ 431,379 ¥ 370,946