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v3.8.0.1

Segment Information - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 24, 2016 USD ($) | Jun. 25, 2016 USD ($) | Mar. 26, 2016 USD ($) | Dec. 30, 2017 USD ($) Customer Segment | Dec. 31, 2016 USD ($) Customer | Dec. 26, 2015 USD ($) Customer | Sep. 20, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
External revenue | $ | $ 1,051,592 | $ 943,430 | $ 870,434 | $ 780,908 | $ 892,829 | $ 787,938 | $ 775,223 | $ 711,644 | $ 3,646,364 | $ 3,167,634 | $ 3,321,091 |
Number of segments | Segment |  |  |  |  |  |  |  |  | 2 |  |  |
Number of customers accounting for 10 percent or more of total revenue | Customer |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
No single customer accounted for benchmark percentage to be considered major customer |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |
Fletes Avella | Landstar Metro |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired by affiliates |  |  |  |  |  |  |  |  |  |  |  | 30.00%
Fletes Avella | Landstar Servicios |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired by affiliates |  |  |  |  |  |  |  |  |  |  |  | 30.00%

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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