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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
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Gross Premium Income ¥ 233,136 ¥ 228,564
Liability for Future Policy Benefit, Interest Expense 16,824 15,348
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Gross Premium Income 89,337 81,607
Liability for Future Policy Benefit, Interest Expense 7,289 6,856
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Gross Premium Income 96,721 99,898
Liability for Future Policy Benefit, Interest Expense 5,543 5,163
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Gross Premium Income 47,078 47,059
Liability for Future Policy Benefit, Interest Expense ¥ 3,992 ¥ 3,329