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Quarterly Statement of Operations Information (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Mar. 30, 2013 | Dec. 29, 2012 | Sep. 29, 2012 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 15.1 | $ 6.7 | $ 11.6 | $ 18.4 | $ 9.7 | $ 6.7 |  | $ 12.5 |  |  | $ 51.7 | $ 32.8 | $ 17.5
Debt extinguishment loss |  |  | 4.4 | 2.9 | 6.0 |  | 3.2 | 3.2 |  |  | 7.4 | 9.2 | 42.3
Additional impairment charge |  |  | 28.6 |  |  |  |  |  |  |  |  |  |
Acquired in-process research and development | 5.1 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of intellectual property |  |  |  |  |  |  |  |  | 53.9 |  | 0 | 53.9 | 12.4
Impairment of goodwill |  |  |  |  | $ 1,100.0 |  |  |  |  | $ 5.8 | $ 0 | $ 1,117.4 | $ 5.8

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 3: 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 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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