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Leases - Narrative (Details)	6 Months Ended
	Jun. 29, 2019
Lessee, Lease, Description [Line Items]
Lease, remaining term (years)	15 years
Lease, option to extend, term (years)	5 years
China and Canada
Lessee, Lease, Description [Line Items]
Lease, option to extend, term (years)	10 years

X

- Definition

Lease, Option to Extend, Term

+ References

No definition available.

+ Details

Name:	kai_LeaseOptiontoExtendTerm
Namespace Prefix:	kai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lease, Remaining Term

+ References

No definition available.

+ Details

Name:	kai_LeaseRemainingTerm
Namespace Prefix:	kai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=kai_ChinaandCanadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: