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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 + References No definition available. + Details
Name: | lxfr_LoanConvertedIntoSecuredLoanNote
Namespace Prefix: | lxfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition [Line Items] for Trade And Other Receivable [Table] + References No definition available. + Details
Name: | lxfr_TradeAndOtherReceivableLineItems
Namespace Prefix: | lxfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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: |