Nature of Operations (Details)	3 Months Ended
Mar. 31, 2026 distributionCenter
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Distribution centers operated by entity	8

Represents the number of other distribution centers operated by entity.

No definition available.

Name:	krt_NumberOfOtherDistributionCentersOperatedByEntity
Namespace Prefix:	krt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration