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Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 01, 2016 | Jan. 01, 2016 | Mar. 27, 2015 | Dec. 26, 2014 | Apr. 01, 2016 | Mar. 27, 2015 | Sep. 25, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cost | $ 357,770 |  |  |  | $ 357,770 |  | $ 252,284
Accumulated Amortization | (141,688) |  |  |  | (141,688) |  | (124,777)
Total | 216,082 |  |  |  | 216,082 |  | 127,507
Purchases of intangible assets | $ 0 | $ 105,300 | $ 0 | $ 6,400 | 105,270 | $ 6,416 |
Weighted average useful life | 0 years | 9 years | 0 years | 18 years |  |  |
Amortization of Intangible Assets | $ 8,200 |  | $ 5,600 |  | 16,700 | $ 11,000 |
Acquired Patents And Technology [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cost | 278,222 |  |  |  | 278,222 |  | 172,787
Accumulated Amortization | (88,261) |  |  |  | (88,261) |  | (74,398)
Total | 189,961 |  |  |  | 189,961 |  | 98,389
Purchases of intangible assets |  |  |  |  | $ 105,000 |  |
Weighted average useful life |  |  |  |  | 9 years |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cost | 56,826 |  |  |  | $ 56,826 |  | 56,933
Accumulated Amortization | (31,262) |  |  |  | (31,262) |  | (28,275)
Total | 25,564 |  |  |  | 25,564 |  | 28,658
Other Intangibles [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cost | 22,722 |  |  |  | 22,722 |  | 22,564
Accumulated Amortization | (22,165) |  |  |  | (22,165) |  | (22,104)
Total | $ 557 |  |  |  | 557 |  | $ 460
Purchases of intangible assets |  |  |  |  | $ 300 |  |
Weighted average useful life |  |  |  |  | 18 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 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=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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