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Goodwill Reported By segment (Detail) - USD ($) $ in Thousands	Dec. 29, 2023	Dec. 30, 2022
Goodwill Reported By Segment [Line Items]
Goodwill	$ 8,607	$ 8,607
Environmental and Health
Goodwill Reported By Segment [Line Items]
Goodwill	8,099	8,099
Engineering and Other Scientific
Goodwill Reported By Segment [Line Items]
Goodwill	$ 508	$ 508

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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