Financial risk management - Summary of Sensitivity Analysis (Detail) - Currency risk [member] - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| U.S. dollar [member] | ||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | ||
| Estimated Impact On Profit Loss Before Tax Due To Increase In The Foreign Exchange Rates In Respect Of Financial Instruments Held | ¥ (14,372) | ¥ (8,100) |
| Euro [member] | ||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | ||
| Estimated Impact On Profit Loss Before Tax Due To Increase In The Foreign Exchange Rates In Respect Of Financial Instruments Held | ¥ 290 | ¥ (28) |