The Company and Its Significant Accounting Policies Earnings Per Common Share (Details) - shares	12 Months Ended
Sep. 24, 2017	Sep. 25, 2016	Sep. 27, 2015
Incremental Dilutive Common Share Equivalents [Abstract]
Dilutive common share equivalents	12,989,000	13,864,000	20,724,000
Common share equivalents excluded from computation of diluted EPS	2,955,000	2,435,000	4,652,000

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 28A
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1500-109256

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