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Investments - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 29, 2012 Y | Jun. 29, 2013 Y
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, maximum maturity period, years | 5 | 5
Unrealized gains, net of unrealized losses, on the investments in the bond portfolio | $ 1,407,000 | $ 169,000

X
- Definition Net amount of the difference between the fair value and cost of investments in available for sale securities. + References No definition available. + Details
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Namespace Prefix: | lstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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