Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Right-of-use assets	$ 16,616	$ 12,310
Retained earnings	270,320	267,658
Long-lived asset impairment	0
Contract asset, current	2,776	2,796
Contract Liabilities, current	4,208	353
Research and development costs charged to expense	$ 15,557	15,163	$ 14,122
Restructuring charges		1,724
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, estimated useful life	1 year
Minimum [Member] | Custom Products [Member]
Summary Of Significant Accounting Policies [Line Items]
Contract period for sale of product	3 months
Minimum [Member] | Various Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Service contracts period	3 months
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, estimated useful life	26 years
Maximum [Member] | Custom Products [Member]
Summary Of Significant Accounting Policies [Line Items]
Contract period for sale of product	1 year
Maximum [Member] | Various Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	5.00%
Service contracts period	1 year
Total Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease liabilities	$ 17,464	$ 12,467
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Right-of-use assets				$ 13,900
Retained earnings				134
ASU 2016-02 | Total Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease liabilities				$ 13,900