Balance Sheet Classification of Contingent Consideration Liability (Detail) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017
Business Combination, Transactions [Line Items]
Other accrued liabilities	$ 370	$ 362
Other accrued liabilities
Business Combination, Transactions [Line Items]
Other accrued liabilities	$ 370	103
Other long-term liabilities
Business Combination, Transactions [Line Items]
Other accrued liabilities		$ 259

The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationLiabilitiesArisingFromContingenciesAmountRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant