Cost of generating revenue from multiple-deliverable arrangements that include licensing fees and maintenance revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Maintenance revenue is derived from maintenance services provided under contracts or arrangements with clients. Services may include the maintenance of software, plant and equipment, and facilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_CostOfServicesLicensesAndMaintenanceAgreements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Related Party transactions (Narrative) (Details)		3 Months Ended		9 Months Ended
Related Party transactions (Narrative) (Details)	Sep. 29, 2017 USD ($) payment	Oct. 01, 2017 USD ($)	Sep. 25, 2016 USD ($)	Oct. 01, 2017 USD ($)	Sep. 25, 2016 USD ($)
Lip-Bu Tan
Related Party Transaction [Line Items]
Purchases from related party		$ 2,000,000	$ 600,000	$ 3,700,000	$ 1,200,000
Software License Arrangement
Related Party Transaction [Line Items]
Term of license	3 years
License quarterly payments \| payment	12
Licenses payment	$ 3,300,000
Licenses and maintenance agreements	$ 1,200,000.000000000