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Equity Investment	6 Months Ended
Equity Investment	Jun. 25, 2022
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract]
Equity investment	(12) Equity investment On April 1, 2022, Landstar Investment Holdco, LLC, a newly formed Delaware LLC and wholly-owned subsidiary of Landstar System Holdings, Inc., purchased Class A units of Cavnue, LLC, for approximately $4,999,000 in cash consideration. Cavnue, LLC is a privately held company focused on combining technology and road infrastructure to unlock the full potential of connected and autonomous vehicles. This non-controlling investment in units of Cavnue, LLC, is considered an investment in non-marketable equity securities without a readily determinable market value. The carrying value of our non-marketable equity securities going forward will be adjusted to fair value upon observable transactions for identical or similar investments of the same issuer or impairment (referred to as the measurement alternative).