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Related parties - Related Party Transactions (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2026 JPY (¥) | Mar. 31, 2025 JPY (¥) | Mar. 31, 2024 JPY (¥) | Mar. 31, 2026 USD ($) | Sep. 01, 2025 JPY (¥)
Disclosure of transactions between related parties [line items] |  |  |  |  |
Percentage of entity's revenue | 5.00% |  |  |  |
Cash repayments of advances and loans from related parties | ¥ 17,758,000,000 | ¥ 7,887,000,000 | ¥ 0 |  |
Parent company |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Business management service fee | 0 | 397,000,000 | 458,000,000 |  |
Total for all subsidiaries |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Borrowing | 2,524,000,000 | 751,000,000 |  |  |
Interest Expense, Related Party Transactions | 144,000,000 | 21,000,000 | 0 |  |
Total for all subsidiaries | Line Of Credit 6,000 Million |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Borrowing | ¥ 0 | 0 |  |  |
Borrowings, interest rate | 1.75% |  |  | 1.75% |
Total for all subsidiaries | Line Of Credit 2,400 Million |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Borrowing | ¥ 2,024,000,000 | ¥ 751,000,000 |  |  |
Line or credit, aggregate commitments | ¥ 2,554,000,000 |  |  | $ 16 |
Borrowings, interest rate | 5.92% | 5.69% |  | 5.92% |
Total for all subsidiaries | Line Of Credit 5,000 Million |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Line or credit, aggregate commitments | ¥ 5,000,000,000 | ¥ 6,000,000,000 |  |  | ¥ 500,000,000
Borrowings, interest rate |  |  |  |  | 9.50%
Associates of parent company |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Provision Of Sales Service, Amounts Payables, Related Party Transactions | 3,000,000 | 5,000,000 |  |  |
Transaction revenue | 8,314,000,000 | 6,396,000,000 | 847,000,000 |  |
Cost of sales | 8,555,000,000 | 6,377,000,000 | 844,000,000 |  |
Provision Of Sales Service, Related Party Transactions | ¥ 42,000,000 | ¥ 42,000,000 | ¥ 26,000,000 |  |

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