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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Restructuring Reserve [Roll Forward] |  |  |
Non-cash impairment charges | $ 0.0 | $ 0.0 | $ (38.4)
Fiscal 2013 Charges [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 12.3
Fiscal 2013 Charges [Member] | Fiscal 2016 Actions [Domain] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2013 Charges [Member] | Fiscal 2015 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2013 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2013 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 3.0
Fiscal 2013 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 9.3
Fiscal 2014 Charges [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 16.9 |
Fiscal restructuring charges |  |  | 46.2
Stock-based compensation |  |  | (6.6)
Non-cash impairment charges |  |  | (3.1)
Severance payments |  |  | (31.0)
Other payments |  |  | (0.9)
Balance |  |  | 16.9
Fiscal 2014 Charges [Member] | Fiscal 2016 Actions [Domain] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0
Stock-based compensation |  |  | 0.0
Non-cash impairment charges |  |  | 0.0
Severance payments |  |  | 0.0
Other payments |  |  | 0.0
Balance |  |  | 0.0
Fiscal 2014 Charges [Member] | Fiscal 2015 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0
Stock-based compensation |  |  | 0.0
Non-cash impairment charges |  |  | 0.0
Severance payments |  |  | 0.0
Other payments |  |  | 0.0
Balance |  |  | 0.0
Fiscal 2014 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 12.0 |
Fiscal restructuring charges |  |  | 29.5
Stock-based compensation |  |  | (6.6)
Non-cash impairment charges |  |  | 0.0
Severance payments |  |  | (10.9)
Other payments |  |  | 0.0
Balance |  |  | 12.0
Fiscal 2014 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | (3.0) |
Fiscal restructuring charges |  |  | 3.0
Stock-based compensation |  |  | 0.0
Non-cash impairment charges |  |  | 0.0
Severance payments |  |  | (3.0)
Other payments |  |  | 0.0
Balance |  |  | (3.0)
Fiscal 2014 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 1.9 |
Fiscal restructuring charges |  |  | 13.7
Stock-based compensation |  |  | 0.0
Non-cash impairment charges |  |  | (3.1)
Severance payments |  |  | (17.1)
Other payments |  |  | (0.9)
Balance |  |  | $ 1.9
Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 5.7 |  |
Fiscal restructuring charges |  | 18.9 |
Stock-based compensation |  | 4.1 |
Severance payments |  | 23.9 |
Other payments |  | 2.1 |
Balance |  | 5.7 |
Fiscal 2015 Charges [Member] | Fiscal 2016 Actions [Domain] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.0 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | 0.0 |
Other payments |  | 0.0 |
Balance |  | 0.0 |
Fiscal 2015 Charges [Member] | Fiscal 2015 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 3.1 |  |
Fiscal restructuring charges |  | 10.0 |
Stock-based compensation |  | 4.1 |
Severance payments |  | 2.8 |
Other payments |  | 0.0 |
Balance |  | 3.1 |
Fiscal 2015 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 2.5 |  |
Fiscal restructuring charges |  | 8.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (16.2) |
Other payments |  | (1.3) |
Balance |  | 2.5 |
Fiscal 2015 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | (0.1) |  |
Fiscal restructuring charges |  | 0.6 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (3.0) |
Other payments |  | (0.5) |
Balance |  | (0.1) |
Fiscal 2015 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.0 |  |
Fiscal restructuring charges |  | 0.3 |
Stock-based compensation |  | 0.0 |
Severance payments |  | 1.9 |
Other payments |  | 0.3 |
Balance |  | $ 0.0 |
Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | (10.5) |  |
Stock-based compensation | (0.4) |  |
Severance payments | (9.0) |  |
Other payments | (0.5) |  |
Balance | 6.3 |  |
Fiscal 2016 Charges [Member] | Fiscal 2016 Actions [Domain] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 10.5 |  |
Stock-based compensation | 0.4 |  |
Severance payments | 4.6 |  |
Other payments | 0.0 |  |
Balance | 5.5 |  |
Fiscal 2016 Charges [Member] | Fiscal 2015 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments | 2.9 |  |
Other payments | 0.0 |  |
Balance | 0.2 |  |
Fiscal 2016 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments | 1.4 |  |
Other payments | 0.5 |  |
Balance | 0.6 |  |
Fiscal 2016 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments | 0.1 |  |
Other payments | 0.0 |  |
Balance | 0.0 |  |
Fiscal 2016 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments | 0.0 |  |
Other payments | 0.0 |  |
Balance | $ 0.0 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 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 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: 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 2: 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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