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Crypto asset borrowings (Details) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Platform Operator, Crypto Asset [Abstract] |  |  |
Crypto asset borrowings fee | ¥ 50 | ¥ 51 | ¥ 35

X
- Definition Crypto Asset Borrowings Fee + References No definition available. + Details
Name: | cnck_CryptoAssetBorrowingsFee
Namespace Prefix: | cnck_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | srt_PlatformOperatorCryptoAssetAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration