Summary of Significant Accounting Policies - Additional Information (Detail) shares in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Jan. 02, 2016 USD ($) Segment shares
Business Description And Accounting Policies [Line Items]
Number of operating segments | Segment			1
Shipping and handling costs	$ 20,600,000	$ 18,300,000	$ 15,400,000
Advertising Expense	1,300,000	200,000	300,000
Research and development costs	$ 1,400,000	$ 1,700,000	2,000,000
Original maturity date of cash and cash equivalents	Three months or less
Warranty expense, average rate	2.09%	2.41%
Portion of warranty expense related to issuance of product	$ 4,800,000	$ 6,800,000	4,800,000
Servicing warranty claims	5,700,000	5,000,000	3,800,000
Capitalization of software	20,000,000	16,600,000
Accumulated depreciation of capitalized software	16,900,000	15,400,000
Amortization expense for capitalized software	1,500,000	900,000	$ 1,100,000
The amount of insured limit exceeds by the balance	32,300,000	$ 37,500,000
Material liability for unrecognized tax benefits	$ 0
Weighted average shares outstanding excluding underlying securities | shares	19	20	66
Minimum [Member]
Business Description And Accounting Policies [Line Items]
Warranty periods	1 year
Warranty period of the majority of products sold	1 year
Maximum [Member]
Business Description And Accounting Policies [Line Items]
Warranty periods	10 years
Warranty period of the majority of products sold	3 years