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Installment Loans - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on loans ¥ 192,375 ¥ 174,485 ¥ 169,401
Loans held for sale in installment loans 201,355 155,680  
Loans held for sale measured at fair value 197,041 151,601  
Installment loans 3,877,602 3,862,604  
Purchased loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Installment loans 12,255 13,747  
Fair value at the acquisition date of purchased loans acquired during the period ¥ 2,444 ¥ 4,926