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Installment Loans - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on loans ¥ 174,485 ¥ 169,401 ¥ 166,966
Loans held for sale in installment loans 155,680 72,658  
Loans held for sale measured at fair value 151,601 63,272  
Installment loans 3,862,604 3,670,784  
Purchased loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Installment loans 13,747 12,351  
Fair value at the acquisition date of purchased loans acquired during the period ¥ 4,926 ¥ 2,704