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Employee Benefit Plans - Percentage Allocation of Plan Assets (Details) - Pension Benefits [Member] | Sep. 26, 2015 | Sep. 27, 2014
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Actual allocation of assets held in trust [Abstract] |  |
Percentage allocation of plan assets | 100.00% | 100.00%
Fixed income securities [Member] |  |
Actual allocation of assets held in trust [Abstract] |  |
Percentage allocation of plan assets | 86.00% | 85.00%
Equity securities [Member] |  |
Actual allocation of assets held in trust [Abstract] |  |
Percentage allocation of plan assets | 14.00% | 15.00%

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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=58740216&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=58740216&loc=d3e1928-114920 + Details
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