Organization and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
Apr. 04, 2026 Site Center Children
Number of community-based and employer-sponsored early childhood education and care services centers \| Center	1,606
Number of children with license capacity \| Children	215,371
Number of sites offered for educational services \| Site	1,159

Number of community based and employer sponsored early childhood education and care services centers.

No definition available.

Name:	klc_NumberOfCommunityBasedAndEmployerSponsoredEarlyChildhoodEducationAndCareServicesCenters
Namespace Prefix:	klc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration