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Business Segments and Geographic Information - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Sep. 24, 2016 USD ($) | Jun. 25, 2016 USD ($) | Mar. 26, 2016 USD ($) | Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($) | Jun. 27, 2015 USD ($) | Mar. 28, 2015 USD ($) | Dec. 27, 2014 USD ($) | Sep. 24, 2016 USD ($) Segment | Sep. 26, 2015 USD ($) | Sep. 27, 2014 USD ($)
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 4 |  |
Revenues | $ 726,800,000 | $ 717,400,000 | $ 693,300,000 | $ 695,200,000 | $ 702,800,000 | $ 693,900,000 | $ 655,500,000 | $ 652,800,000 | $ 2,832,700,000 | $ 2,705,000,000 | $ 2,530,700,000
Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Diagnostics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,236,900,000 | $ 1,211,800,000 | $ 1,186,800,000

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- Definition Segment Reporting Disclosure [Line Items] + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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