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Share-based payments - Narrative (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2026 JPY (¥) | Mar. 31, 2026 USD ($) $ / shares shares | Mar. 31, 2025 JPY (¥) | Mar. 31, 2024 JPY (¥)
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Share-based compensation | ¥ 1,320 |  | ¥ 0 | ¥ 0
Restricted share units |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Share-based compensation | ¥ 1,320 |  |  |
Unrecognized costs of unvested RSUs | $ |  | $ 14 |  |
Weighted-average recognition period | 1 year 10 months 17 days |  |  |
Service-Based Conditions, Restricted Share Units | Bottom of range |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Vesting period | 10 months |  |  |
Service-Based Conditions, Restricted Share Units | Top of range |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Vesting period | 3 years |  |  |
Market Conditions, Restricted Share Units |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Calendar days | 30 days |  |  |
Market Conditions, Restricted Share Units | Bottom of range |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Average closing price (in USD per share) | $ / shares |  | $ 12.00 |  |
Thunder Bridge |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Ordinary share per unit delivered once vested | shares |  | 1 |  |

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