Employee benefits - Summary of Fair Value of Plan Assets Foreign Defined Benefit Plans (Detail) - Foreign Defined Benefit Plan [Member] - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
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Disclosure of fair value of plan assets [line items] | ||||||||||||
Cash and cash equivalents | ¥ 4,599 | ¥ 4,692 | ||||||||||
Equity securities | [1] | 101 | 84 | |||||||||
Fixed income securities contributed to fair value of plan assets [Abstract] | ||||||||||||
Government bonds | [2] | 1,207 | 1,152 | |||||||||
Corporate bonds | [3] | 175 | 160 | |||||||||
Asset-backed securities | 43 | 36 | ||||||||||
Insurance contracts | [4] | 23,057 | 21,736 | |||||||||
Commingled funds | [5] | 16,929 | 16,682 | |||||||||
Real estate and other | 3,537 | 3,351 | ||||||||||
Total | 49,648 | 47,893 | ||||||||||
Quoted Market Prices in Active Market [Member] | ||||||||||||
Disclosure of fair value of plan assets [line items] | ||||||||||||
Cash and cash equivalents | 4,599 | 4,692 | ||||||||||
Equity securities | [1] | 101 | 84 | |||||||||
Fixed income securities contributed to fair value of plan assets [Abstract] | ||||||||||||
Insurance contracts | [4] | 334 | 359 | |||||||||
Real estate and other | 10 | |||||||||||
Total | 5,034 | 5,145 | ||||||||||
Unquoted Market Prices in Active Market [Member] | ||||||||||||
Fixed income securities contributed to fair value of plan assets [Abstract] | ||||||||||||
Government bonds | [2] | 1,207 | 1,152 | |||||||||
Corporate bonds | [3] | 175 | 160 | |||||||||
Asset-backed securities | 43 | 36 | ||||||||||
Insurance contracts | [4] | 22,723 | 21,377 | |||||||||
Commingled funds | [5] | 16,929 | 16,682 | |||||||||
Real estate and other | 3,537 | 3,341 | ||||||||||
Total | ¥ 44,614 | ¥ 42,748 | ||||||||||
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