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Trade and other receivables - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Minimum
Trade And Other Receivable [Line Items]
Trade receivables, term	30 days
Maximum
Trade And Other Receivable [Line Items]
Trade receivables, term	90 days
Sub161 Pty Limited
Trade And Other Receivable [Line Items]
Loan converted into secured loan note		$ 3.6

X

- Definition

Loan Converted Into Secured Loan Note

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No definition available.

+ Details

Name:	lxfr_LoanConvertedIntoSecuredLoanNote
Namespace Prefix:	lxfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

[Line Items] for Trade And Other Receivable [Table]

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No definition available.

+ Details

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

X

- Definition

Trade Receivables, Term

+ References

No definition available.

+ Details

Name:	lxfr_TradeReceivablesTerm
Namespace Prefix:	lxfr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=lxfr_Sub161PtyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: