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Write-Downs of Long-Lived Assets - Breakdowns of Recognized Impairment Losses for Difference between Carrying Amounts and Fair Values Reflected as Write-Downs of Long-Lived Assets (Detail)
¥ in Millions
 6 Months Ended
Sep. 30, 2025
JPY (¥)
Property
Sep. 30, 2024
JPY (¥)
Property
Impaired Long-Lived Assets Held and Used [Line Items]    
Write-downs of the assets held for sale, amount ¥ 1,122 ¥ 240
Write-downs of the assets held for sale, number of properties | Property
Write-downs due to decline in estimated future cash flows, amount ¥ 275 ¥ 266
Write-downs due to decline in estimated future cash flows, number of properties | Property 0
Condominiums    
Impaired Long-Lived Assets Held and Used [Line Items]    
Write-downs of the assets held for sale, amount ¥ 6 ¥ 5
Write-downs of the assets held for sale, number of properties | Property 2 2
Write-downs due to decline in estimated future cash flows, amount ¥ 0 ¥ 0
Write-downs due to decline in estimated future cash flows, number of properties | Property 0 0
Others    
Impaired Long-Lived Assets Held and Used [Line Items]    
Write-downs of the assets held for sale, amount [1] ¥ 1,116 ¥ 235
Write-downs due to decline in estimated future cash flows, amount [1] ¥ 275 ¥ 266
[1] For “Others,” the number of properties is omitted.