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Employee Benefit Plans - Schedule of Assumptions Used (Details) | 12 Months Ended
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Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013
Actuarial assumptions [Abstract] |  |  |
Health care cost trend | 4.50% |  |
Assumptions used in calculating benefit cost [Abstract] |  |  |
Health care cost trend | 7.10% |  |
Pension Benefits [Member] |  |  |
Actuarial assumptions [Abstract] |  |  |
Weighted-average discount rate used in calculating benefit obligations | 3.875% | 3.875% |
Assumptions used in calculating benefit cost [Abstract] |  |  |
Weighted-average discount rate | 3.875% | 4.375% | 3.50%
Weighted-average expected long-term rate of return on plan assets | 4.90% | 4.90% | 4.50%
Retiree Health and Life Benefits [Member] |  |  |
Actuarial assumptions [Abstract] |  |  |
Weighted-average discount rate used in calculating benefit obligations | 3.50% | 3.50% |
Health care cost trend | 7.10% | 7.12% |
Assumptions used in calculating benefit cost [Abstract] |  |  |
Weighted-average discount rate | 3.50% | 3.75% | 3.00%
Health care cost trend | 7.12% | 7.33% | 7.53%

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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