Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended												12 Months Ended
	Dec. 31, 2016 USD ($)	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016 USD ($)	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2016 USD ($) Segment $ / shares	Jan. 02, 2016 USD ($)	Jan. 03, 2015 USD ($)	Dec. 31, 2005 USD ($)
Accounting Policies [Abstract]
Number of reportable segments | Segment													2
Acquired Indefinite-lived Intangible Assets [Line Items]
Operating cycle	91 days	91 days	91 days	91 days	91 days	91 days	91 days	91 days	98 days	91 days	91 days	91 days	364 days	364 days	371 days
Excess tax benefit related to share-based compensation													$ 582,000
Percentage of completion revenue													23,300,000	$ 32,078,000	$ 19,078,000
Inventory for long-term contracts					$ 274,000									274,000
Advance payments on long-term contracts	$ 5,158,000				2,374,000								5,158,000	2,374,000
Due from bankers acceptances drafts	7,852,000				8,314,000								7,852,000	8,314,000
Restricted cash	2,082,000				$ 1,406,000								2,082,000	1,406,000
Cost of goods and services sold, depreciation and amortization													$ 6,194,000	5,814,000	5,661,000
Weighted average useful life of acquired intangible assets													12 years
Amortization expense of acquired intangible assets													$ 8,132,000	5,007,000	$ 5,528,000
Estimated Future Amortization Expense [Abstract]
2017	6,832,000												6,832,000
2018	6,481,000												6,481,000
2019	5,945,000												5,945,000
2020	5,450,000												5,450,000
2021	5,051,000												5,051,000
Thereafter	$ 14,871,000												14,871,000
Johnson tradename
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired													8,100,000	8,100,000		$ 8,100,000
Impairment of intangible assets													$ 0	$ 0
Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Operating cycle													364 days
Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Operating cycle													371 days
Accounting Standards Update 2016-09
Acquired Indefinite-lived Intangible Assets [Line Items]
Excess tax benefit related to share-based compensation per diluted share (in dollars per share) | $ / shares													$ 0.05