XML 26 R43.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Investments - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 27, 2014 | Dec. 28, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Investments maximum maturity period | 5 years | 5 years
Unrealized gains, net of unrealized losses, on the investments in the bond portfolio | $ 432,000 | $ 378,000

X
- Definition Investments maximum maturity period, years + References No definition available. + Details
Name: | lstr_InvestmentsMaximumMaturityPeriodYears
Namespace Prefix: | lstr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration