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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Gross Premiums And Interest Expense (Detail) - JPY (¥)
¥ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for Future Policy Benefit, Gross Premium Income ¥ 116,919 ¥ 117,444 ¥ 221,724 ¥ 220,170
Liability for Future Policy Benefit, Interest Expense 6,936 6,189 13,628 12,136
Yen-denominated insurance (First Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for Future Policy Benefit, Gross Premium Income 38,306 37,775 74,702 73,383
Liability for Future Policy Benefit, Interest Expense 3,263 3,049 6,484 6,047
Yen-denominated insurance (Third Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for Future Policy Benefit, Gross Premium Income 51,362 51,906 102,734 103,314
Liability for Future Policy Benefit, Interest Expense 2,406 2,258 4,763 4,465
Foreign currency denominated insurance        
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for Future Policy Benefit, Gross Premium Income 27,251 27,763 44,288 43,473
Liability for Future Policy Benefit, Interest Expense ¥ 1,267 ¥ 882 ¥ 2,381 ¥ 1,624