Income Taxes - Components of Net Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 29, 2017	Dec. 30, 2016
Net non-current deferred tax asset:
Net non-current deferred tax asset	$ 4,951	$ 1,355
Total deferred tax asset	3,979	120
Current deferred tax liability:
Undistributed earnings	(2,516)	(1,126)
Non-current deferred tax liability:
Goodwill	(6,493)	(7,556)
Net deferred tax asset (liability)	(5,030)	(8,562)
Deferred Tax Assets Noncurrent [Member]
Net non-current deferred tax asset:
Inventory valuation and basis difference	2,703	3,359
State taxes	50	49
Stock compensation	1,398	1,788
Other accrued expenses	1,148	1,748
Depreciation	302	1,347
Intangibles	3,387	5,105
Net operating losses	3,055	9,588
Research & other credits		980
Deferred tax assets, gross non-current	12,043	23,964
Valuation allowance	(8,064)	(23,844)
Net non-current deferred tax asset	$ 3,979	$ 120