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Employee benefits - Employee Benefit Expenses (Details) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Employee Benefits [Abstract] |  |  |
Termination benefits | ¥ 282 | ¥ 39 | ¥ 1

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- Definition Employee Benefits [Abstract] + References No definition available. + Details
Name: | cnck_EmployeeBenefitsAbstract
Namespace Prefix: | cnck_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 171 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_171&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_TerminationBenefitsExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration