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Restructuring Charges - Additional Information (Details) $ in Thousands | 3 Months Ended | 26 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 30, 2017 USD ($) employee | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 105 | $ 6,285 | $ 85,500 |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  |  | 800 |  |
Restructuring Reserve | 5,613 | 25,649 | $ 5,613 | $ 6,244 | $ 36,608
Employee severance and related benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | (212) | 2,399 |  |  |
Restructuring Reserve | 1,343 | 20,896 | 1,343 | 1,736 | 35,177
Facility closures and related costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 317 | 3,886 |  |  |
Restructuring Reserve | 4,270 | $ 4,753 | 4,270 | $ 4,508 | $ 1,431
Assumed Sublease Income | 3,700 |  | 3,700 |  |
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | 2,200 |  | 2,200 |  |
Other Noncurrent Liabilities [Member] | Facility closures and related costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | $ 2,100 |  | $ 2,100 |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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