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Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Parenthetical) (Detail)	Sep. 27, 2025
Maximum [Member]
Finance lease Interest rate percentage	6.40%
Minimum [Member]
Finance lease Interest rate percentage	1.60%

X

- Definition

Finance lease Interest rate percentage

+ References

No definition available.

+ Details

Name:	lstr_FinanceLeaseInterestRatePercentage
Namespace Prefix:	lstr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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: