Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Allowance For Bad Debt [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		$ 945	$ 847	$ 917
Provision Charged to Expense		443	484	293
Provision Charged to Revenues		0	0	0
Accounts Written-off Net of Recoveries	[1]	(509)	(386)	(363)
Balance at End of Year		879	945	847
Allowance For Contract Losses [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		3,350	3,219	2,609
Provision Charged to Expense		0	0	0
Provision Charged to Revenues		1,406	1,740	1,940
Accounts Written-off Net of Recoveries	[1]	(1,640)	(1,609)	(1,330)
Balance at End of Year		$ 3,116	$ 3,350	$ 3,219

[1] Balance includes currency translation adjustments.