Income Taxes - Net Deferred Tax (Liability) Asset (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Deferred Tax Asset:
Foreign, state, and alternative minimum tax credit carryforwards	$ 185	$ 161
Reserves and accruals	4,455	4,842
Net operating loss carryforwards	15,161	13,694
Inventory basis difference	3,265	3,005
Research and development	88	75
Employee compensation	2,610	4,966
Allowance for doubtful accounts	505	488
Revenue recognition	0	636
Other	59	249
Deferred tax asset, gross	26,328	28,116
Less: valuation allowance	(10,835)	(10,863)
Deferred tax asset, net	15,493	17,253
Deferred Tax Liability:
Goodwill and intangible assets	(32,120)	(21,853)
Fixed asset basis difference	(4,213)	(4,325)
Provision for unremitted foreign earnings	(2,718)	0
Other	(554)	(1,199)
Deferred tax liability	(39,605)	(27,377)
Net deferred tax liability	$ (24,112)	$ (10,124)