Share Plans (Schedule of Fair Value Assumptions for Performance Share Unit) (Details) - Performance Shares	3 Months Ended	12 Months Ended
Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected stock price volatility	48.00%	48.00%	41.00%	27.00%
Peer group stock price volatility	40.00%	40.00%	36.00%	32.00%
Correlation of returns	17.00%	17.00%	24.00%	14.00%

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Balance Type:	na
Period Type:	duration