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Summary of Significant Accounting Policies - Rollforward of Accumulated Goodwill Impairment Losses by Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2013 | Sep. 29, 2012 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Accumulated Goodwill Impairment Losses by Reportable Segment [Roll Forward] |  |  |  |  |
Balance at September 28, 2013 |  |  | $ 3,539.9 |  |
Impairment charge | (1,100.0) | (5.8) | 0 | (1,117.4) | (5.8)
Balance at September 27, 2014 | 3,539.9 |  | 3,539.9 | 3,539.9 |
Diagnostics [Member] |  |  |  |  |
Accumulated Goodwill Impairment Losses by Reportable Segment [Roll Forward] |  |  |  |  |
Balance at September 28, 2013 |  |  | 2,025.7 |  |
Impairment charge |  |  | 0 |  |
Balance at September 27, 2014 |  |  | 2,025.7 |  |
Breast Health [Member] |  |  |  |  |
Accumulated Goodwill Impairment Losses by Reportable Segment [Roll Forward] |  |  |  |  |
Balance at September 28, 2013 |  |  | 348.4 |  |
Impairment charge |  |  | 0 |  |
Balance at September 27, 2014 |  |  | 348.4 |  |
GYN Surgical [Member] |  |  |  |  |
Accumulated Goodwill Impairment Losses by Reportable Segment [Roll Forward] |  |  |  |  |
Balance at September 28, 2013 |  |  | 1,165.8 |  |
Impairment charge |  |  | 0 |  |
Balance at September 27, 2014 |  |  | $ 1,165.8 |  |

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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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