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Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 29, 2017		Dec. 30, 2016		Jan. 01, 2016
Segment Reporting Information [Line Items]
Revenues	$ 88,282	$ 87,555	$ 87,840	$ 84,122	$ 77,013	$ 77,612	$ 77,295	$ 83,156	$ 347,799	[1]	$ 315,076	[1]	$ 312,832	[1]
Operating Income	$ 17,795	$ 19,305	$ 20,317	$ 14,634	$ 14,949	$ 15,595	$ 14,931	$ 16,436	72,051		61,911		68,933
Capital Expenditures									4,725		14,393		5,379
Depreciation and Amortization									6,285		6,131		5,479
Operating segments
Segment Reporting Information [Line Items]
Operating Income									115,791		99,144		98,627
Capital Expenditures									3,866		4,433		3,361
Depreciation and Amortization									4,628		4,610		4,101
Engineering and Other Scientific
Segment Reporting Information [Line Items]
Revenues									277,603		248,297		237,959
Operating Income									93,451		80,494		76,817
Capital Expenditures									3,648		4,309		3,197
Depreciation and Amortization									4,449		4,429		3,919
Environmental and Health
Segment Reporting Information [Line Items]
Revenues									70,196		66,779		74,873
Operating Income									22,340		18,650		21,810
Capital Expenditures									218		124		164
Depreciation and Amortization									179		181		182
Corporate
Segment Reporting Information [Line Items]
Operating Income									(43,740)		(37,233)		(29,694)
Capital Expenditures									859		9,960		2,018
Depreciation and Amortization									$ 1,657		$ 1,521		$ 1,378
[1] Geographic revenues are allocated based on the location of the client.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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