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Restructuring and Other Charges (Additional Information) (Details) $ in Thousands | 3 Months Ended
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Dec. 29, 2018 USD ($) employee | Dec. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges, net | $ 18,493 | $ 105
Free rent and estimated sublease income new headquarters | 30,000 |
estimated undiscounted cash flows old headquarters | 29,000 |
Facility closures and related costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Assumed Sublease Income | 1,900 |
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 1,300 | 2,200
Other Noncurrent Liabilities [Member] | Facility closures and related costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 1,000 | $ 2,100
Restructuring Plan 2019 [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges, net | $ 16,300 |
Restructuring and Related Cost, Number of Positions Eliminated | employee | 240 |
Prior Year Plans [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges, net | $ 300 |
Prior Headquarters [Member] | Facility closures and related costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and Related Cost, Expected Cost | 24,000 |
Depreciation | $ 1,900 |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: 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 2: 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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