Leases - Supplemental Cash Flow Information to Leases Footnote (Details) $ in Thousands	9 Months Ended
Sep. 28, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Right-of-use asset obtained in exchange for operating lease liability	$ 27,949
Right-of-use asset obtained in exchange for finance lease liability	3,575
ASU No. 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use asset obtained in exchange for operating lease liability	12,632
Right-of-use asset obtained in exchange for finance lease liability	2,224
ASU No. 2016-02 \| Syntron Material Handling Group, LLC
Lessee, Lease, Description [Line Items]
Right-of-use asset obtained in exchange for operating lease liability	10,994
Right-of-use asset obtained in exchange for finance lease liability	$ 528

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.

No definition available.

+ Details

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

- Definition

Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

Name:	us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

+ Details

Name:	us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=kai_SyntronMaterialHandlingGroupLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: