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Leases - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Schedule of Operating Leases [Line Items] |  |
Lease receivable of net investment expiration period | 17 years |
Remaining expiration period | 56 years |
Sale and leaseback transaction, gain (loss), net |  | ¥ 2,661

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