Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Allowance For Bad Debt [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		$ 838	$ 1,016	$ 942
Provision Charged to Expense		443	284	264
Provision Charged to Revenues		0	0	0
Accounts Written-off Net of Recoveries	[1]	(358)	(462)	(190)
Balance at End of Year		923	838	1,016
Allowance For Contract Losses [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		1,954	2,370	1,829
Provision Charged to Expense		0	0	0
Provision Charged to Revenues		2,009	645	1,454
Accounts Written-off Net of Recoveries	[1]	(1,469)	(1,061)	(913)
Balance at End of Year		$ 2,494	$ 1,954	$ 2,370

[1] Balance includes currency translation adjustments.