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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument ¥ in Millions, £ in Millions	Mar. 29, 2020 GBP (£) € / £ $ / £ $ / £	Dec. 31, 2019 GBP (£) € / £ ¥ / £ $ / £ $ / £	Dec. 31, 2019 JPY (¥) € / £ ¥ / £ $ / £ $ / £
U.S. dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 6.8	£ 0.1
Exchange rates		1.2914	1.2914
U.S. dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates	1.1617
U.S. dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates	1.2281
U.S. dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 1.4	£ 1.3
Exchange rates		1.3228	1.3228
U.S. dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.2303
U.S. dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.3132
Euros | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 9.9	£ 7.6
Euros | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1151	1.5510	1.5510
Euros | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.1914	1.1750	1.1750
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.8	£ 0.8
Exchange rates | € / £		1.1663	1.1663
Euros | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1663
Canadian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 6.8	£ 7.0
Canadian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.7018	1.7137	1.7137
Canadian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.7240	1.7664	1.7664
Japan, Yen | Sales hedges
Derivative [Line Items]
Contract totals/£m | ¥			¥ 0.1
Exchange rates | ¥ / £		142.8600	142.8600

X

- Definition

Derivative, Notional Amount1

+ References

No definition available.

+ Details

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Namespace Prefix:	lxfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeForwardExchangeRate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lxfr_ForeignExchangeForwardSalesHedgesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lxfr_ForeignExchangeForwardPurchaseHedgesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_CAD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_JPY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: