Retirement Plans - Weighted Average Allocations (Details)	12 Months Ended
Sep. 30, 2016	Sep. 25, 2015
U.S. Plans
Target asset allocation
Target asset allocation funded status minimum (as a percent)	105.00%
Target weighted average asset allocations (as a percent)	100.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	100.00%	100.00%
U.S. Plans \| Equity securities
Target asset allocation
Target weighted average asset allocations (as a percent)	45.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	45.00%	45.00%
U.S. Plans \| Debt securities
Target asset allocation
Target weighted average asset allocations (as a percent)	55.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	55.00%	55.00%
Non-U.S. Plans
Target asset allocation
Target weighted average asset allocations (as a percent)	100.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	100.00%	100.00%
Non-U.S. Plans \| Equity securities
Target asset allocation
Target weighted average asset allocations (as a percent)	41.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	41.00%	45.00%
Non-U.S. Plans \| Debt securities
Target asset allocation
Target weighted average asset allocations (as a percent)	38.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	33.00%	29.00%
Non-U.S. Plans \| Insurance contracts and other investments
Target asset allocation
Target weighted average asset allocations (as a percent)	19.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	24.00%	24.00%
Non-U.S. Plans \| Real estate investments
Target asset allocation
Target weighted average asset allocations (as a percent)	2.00%
Weighted average asset allocations
Total weighted average asset allocations (as a percent)	2.00%	2.00%
Long-term Target Asset Allocation \| U.S. Plans \| Equity securities
Target asset allocation
Target weighted average asset allocations (as a percent)	10.00%
Long-term Target Asset Allocation \| U.S. Plans \| Debt securities
Target asset allocation
Target weighted average asset allocations (as a percent)	90.00%

Represents the minimum percentage of funded status determined by the Pension Protection Act after which we expect to reach our target asset allocation.

No definition available.

+ Details

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- References

No definition available.

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- References

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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