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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification out of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance beginning |  | $ (48,883) | $ (45,905) | $ (47,353)
Other comprehensive income before reclassifications |  | (4,569) | (10,202) | (3,779)
Recognition in earnings of net actuarial loss for pension settlement |  | 2,000 | 2,000 | 0
Reclassifications to earnings |  | 5,620 | 5,224 | 5,227
Other comprehensive income (loss) |  | 3,051 | (2,978) | 1,448
Balance ending |  | (45,832) | (48,883) | (45,905)
Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance beginning |  | (1,311) | (1,540) | (2,428)
Other comprehensive income before reclassifications |  | 6 | (1,159) | (518)
Reclassifications to earnings | [1] | 1,100 | 1,388 | 1,406
Other comprehensive income (loss) |  | 1,106 | 229 | 888
Balance ending |  | (205) | (1,311) | (1,540)
Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance beginning |  | (52,836) | (49,034) | (49,987)
Funded status benefit plan obligation |  | (5,773) | (10,324) | (3,539)
Recognition in earnings of net actuarial loss for pension settlement | [2] | 2,000 | 2,000 | 0
Other comprehensive income (loss) |  | 1,445 | (3,802) | 953
Balance ending |  | (51,391) | (52,836) | (49,034)
Amortization of Net Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications to earnings | [2] | 5,218 | 4,522 | 4,492
Post-Retirement Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance beginning |  | 5,264 | 4,669 | 5,062
Funded status benefit plan obligation |  | 1,198 | 1,281 | 278
Other comprehensive income (loss) |  | 500 | 595 | (393)
Balance ending |  | 5,764 | 5,264 | 4,669
Amortization of Prior Service Credits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications to earnings | [2] | (399) | (490) | (490)
Amortization of Net (Gain) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications to earnings | [2] | $ (299) | $ (196) | $ (181)
[1] | Reclassification of realized losses on cash flow hedges are recognized in interest expense.
[2] | These amounts are included in the computation of net periodic benefit cost. See Note 10, “Employee Benefit Plans”.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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