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Share Plans - Narrative (Details) - $ / shares	1 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 27, 2021
Share-based Payment Arrangement [Abstract]
Granted during the year (in shares)	110,000	19,184
Granted during the year (in USD per share)	$ 21.14	$ 21.69
Granted during the year, based on total shareholder return (in shares)	45,000

X

- Definition

Class Of Warrants Or Rights Issued During The Period

+ References

No definition available.

+ Details

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Namespace Prefix:	lxfr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration