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Net Sales - Significant Changes in Contract Liabilities (Details) $ in Millions	9 Months Ended
	Sep. 27, 2020 USD ($)
Contract With Customer, Asset (Liability) [Roll Forward]
Beginning balance	$ (0.5)
Net (payments received) / amounts billed	(0.6)
Net (costs incurred) / revenue recognized	0.9
Ending balance	$ (0.2)

X

- Definition

Contract With Customer, Liability, Costs Incurred And Revenue Recognized

+ References

No definition available.

+ Details

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Namespace Prefix:	lxfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Increase From Payments Received And Amounts Billed Over Costs Incurred

+ References

No definition available.

+ Details

Name:	lxfr_ContractWithCustomerLiabilityIncreaseFromPaymentsReceivedAndAmountsBilledOverCostsIncurred
Namespace Prefix:	lxfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability [Roll Forward]

+ References

No definition available.

+ Details

Name:	lxfr_ContractWithCustomerLiabilityRollForward
Namespace Prefix:	lxfr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant