Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Allowance For Bad Debt [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 1,016	$ 942	$ 933
Provision Charged to Expense	284	264	515
Provision Charged to Revenues	0	0	0
Accounts Written-off Net of Recoveries	(462)	(190)	(506)
Balance at End of Year	838	1,016	942
Allowance For Contract Losses [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	2,370	1,829	1,733
Provision Charged to Expense	0	0	0
Provision Charged to Revenues	645	1,454	1,189
Accounts Written-off Net of Recoveries	(1,061)	(913)	(1,093)
Balance at End of Year	$ 1,954	$ 2,370	$ 1,829