Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		$ 2,117	$ 1,330	$ 1,401
Additions charged to costs and expenses		2,534	1,234	550
Deductions		203	447	621
Balance at end of year		4,448	2,117	1,330
Deferred Income Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		2,307	3,640	3,553
Additions charged to costs and expenses			28	1,203
Additions charged to other	[1]			7
Deductions credited to expense		689	1,361
Deductions				1,123
Balance at end of year		$ 1,618	$ 2,307	$ 3,640

[1] Valuation allowance adjustment for Fast Forward Energy, Inc., which was liquidated during 2014.