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v3.25.4

Accounting principles - Consumer Receivales (Details) - Fair Financing receivables | 12 Months Ended
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Dec. 31, 2025
Minimum |
Disclosure of financial assets [line items] |
Consumer receivables, installment plan, period | 3 months
Maximum |
Disclosure of financial assets [line items] |
Consumer receivables, installment plan, period | 48 months

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Consumer Receivables, Installment Plan, Period + References No definition available. + Details
Name: | klar_ConsumerReceivablesInstallmentPlanPeriod
Namespace Prefix: | klar_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=klar_FairFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |