Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Allowance For Bad Debt [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		$ 847	$ 917	$ 923
Provision Charged to Expense		484	293	473
Provision Charged to Revenues		0	0	0
Accounts Written-off Net of Recoveries	[1]	(386)	(363)	(479)
Balance at End of Year		945	847	917
Allowance For Contract Losses [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		3,219	2,609	2,494
Provision Charged to Expense		0	0	0
Provision Charged to Revenues		1,740	1,940	2,033
Accounts Written-off Net of Recoveries	[1]	(1,609)	(1,330)	(1,918)
Balance at End of Year		$ 3,350	$ 3,219	$ 2,609

[1] Balance includes currency translation adjustments.