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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification out of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 25, 2017 | Mar. 31, 2018 | Mar. 25, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance beginning |  | $ (28,055) | $ (44,434) | $ (28,812) | $ (45,832)
Other comprehensive income before reclassifications |  | 0 | (5) | 0 | (10)
Reclassifications to earnings |  | 757 | 1,218 | 1,514 | 2,621
Other comprehensive income |  | 757 | 1,213 | 1,514 | 2,611
Balance ending |  | (27,298) | (43,221) | (27,298) | (43,221)
Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance beginning |  | 0 | (10) | 0 | (205)
Other comprehensive income before reclassifications |  | 0 | (5) | 0 | (10)
Reclassifications to earnings | [1] | 0 | 15 | 0 | 215
Other comprehensive income |  | 0 | 10 | 0 | 205
Balance ending |  | 0 | 0 | 0 | 0
Pension Benefits [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance beginning |  | (36,390) | (50,091) | (37,311) | (51,391)
Other comprehensive income |  | 921 | 1,300 | 1,842 | 2,600
Balance ending |  | (35,469) | (48,791) | (35,469) | (48,791)
Amortization of Net Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassifications to earnings | [2] | 921 | 1,300 | 1,842 | 2,600
Post-Retirement Benefits [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance beginning |  | 8,335 | 5,667 | 8,499 | 5,764
Other comprehensive income |  | (164) | (97) | (328) | (194)
Balance ending |  | 8,171 | 5,570 | 8,171 | 5,570
Amortization of Net (Gain) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassifications to earnings | [2] | $ (164) | $ (97) | $ (328) | $ (194)
[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 13, “Pension Plans and Other Postretirement Benefits.”

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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=84228862&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=84228862&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=84228862&loc=SL7669686-108580 + Details
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