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v3.25.4

Other assets - Additional Information (Details) $ in Millions | Dec. 31, 2025 USD ($)
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Miscellaneous assets [abstract] |
Commercial agreement, fair market value | $ 85
Commercial agreement assets, outstanding | $ 75

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- References No definition available. + Details
Name: | ifrs-full_MiscellaneousAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Commercial Agreement Assets, Outstanding + References No definition available. + Details
Name: | klar_CommercialAgreementAssetsOutstanding
Namespace Prefix: | klar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Commercial Agreement, Fair Market Value + References No definition available. + Details
Name: | klar_CommercialAgreementFairMarketValue
Namespace Prefix: | klar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant