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Fair value measurement - Fair value hierarchy of assets and liabilities measured at fair value (Details) - JPY (¥) ¥ in Millions | Mar. 31, 2026 | Mar. 31, 2025
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Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | ¥ 117,121 | ¥ 112,353
Liabilities | 95,375 | 101,584
Recurring |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 38,040 | 44,748
Liabilities | 37,676 | 44,889
Recurring | Crypto asset borrowings |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 37,543 | 44,479
Recurring | Public warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 128 | 398
Recurring | Private warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 4 | 12
Recurring | Cryptocurrencies |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 37,876 | 44,680
Recurring | Derivatives |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 164 | 68
Recurring | Level 1 |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 37,986 | 44,702
Liabilities | 37,672 | 44,878
Recurring | Level 1 | Crypto asset borrowings |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 37,543 | 44,479
Recurring | Level 1 | Public warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 128 | 398
Recurring | Level 1 | Private warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 0 | 0
Recurring | Level 1 | Cryptocurrencies |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 37,876 | 44,680
Recurring | Level 1 | Derivatives |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 110 | 22
Recurring | Level 2 |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Recurring | Level 2 | Crypto asset borrowings |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 0 | 0
Recurring | Level 2 | Public warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 0 | 0
Recurring | Level 2 | Private warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 0 | 0
Recurring | Level 2 | Cryptocurrencies |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 0 | 0
Recurring | Level 2 | Derivatives |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 0 | 0
Recurring | Level 3 |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 54 | 46
Liabilities | 4 | 12
Recurring | Level 3 | Crypto asset borrowings |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 0 | 0
Recurring | Level 3 | Public warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 0 | 0
Recurring | Level 3 | Private warrant liabilities |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Liabilities | 4 | 12
Recurring | Level 3 | Cryptocurrencies |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | 0 | 0
Recurring | Level 3 | Derivatives |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities [Line Items] |  |
Assets | ¥ 54 | ¥ 46

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- Definition Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets and Liabilities + References No definition available. + Details
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