The Company and Its Significant Accounting Policies Concentrations (Details)	12 Months Ended
Sep. 24, 2017	Sep. 25, 2016	Sep. 27, 2015
Customer/licensee one [Member] \| Customer Concentration Risk [Member] \| Revenue [Member]
Concentration Risk [Line Items]
Percentage of total	18.00%	24.00%	25.00%
Customer/licensee two [Member] \| Customer Concentration Risk [Member] \| Revenue [Member]
Concentration Risk [Line Items]
Percentage of total	17.00%	16.00%	20.00%
Largest Customer [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Percentage of total	10.00%	14.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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