Product Warranties (Narrative) (Detail)	9 Months Ended
Sep. 29, 2017
Minimum
Product Warranty Liability [Line Items]
Warranty periods for products sold, in months and years	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty periods for products sold, in months and years	2 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration