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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 24, 2016 USD ($) Customer | Mar. 26, 2016 USD ($) | Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) Customer | Sep. 24, 2016 USD ($) Customer | Sep. 26, 2015 USD ($) | Jul. 02, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 07, 2017 USD ($) | Mar. 22, 2017 USD ($) | Jun. 25, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  |  |  |  | $ 10,300,000 |  |  |  |  |  |  |
Marketable Securities, Unrealized Gain (Loss) |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalent maturity period |  |  |  |  |  |  |  | three months or less |  |  |  |  |  |  |
Net (gains) losses reclassified from accumulated other comprehensive income to the statement of income |  |  |  |  | $ 7,200,000 |  |  | $ 2,400,000 | $ 6,100,000 | $ 0 |  |  |  |  |
Equity investment impairment charges |  |  |  |  |  |  |  | $ 0 | $ 1,100,000 | 7,800,000 |  |  |  |  |
Number of customers with balance greater than specified percentage | Customer |  |  | 0 |  |  |  |  | 0 | 0 |  |  |  |  |  |
Accumulated Amortization |  |  | $ 2,681,500,000 |  |  |  |  | $ 2,742,100,000 | $ 2,681,500,000 |  |  |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  |  | $ 4,800,000 |  |  |  |  |  |  |  |  |  |  |
Sensitivity Change To Fair Value By Percent |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Goodwill |  |  | 2,803,100,000 |  |  |  |  | $ 3,171,200,000 | 2,803,100,000 |  |  |  |  |  |
Other-than-temporary impairment charges |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Purchase of interest rate caps |  |  |  |  |  |  |  | 1,900,000 | 0 | 13,200,000 |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |
Loss reclassified from accumulated other comprehensive income to the statement of operations, net |  |  |  |  |  |  |  | 6,900,000 | 3,900,000 | 0 |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments |  |  |  |  |  |  |  | 3,100,000 | 1,500,000 |  |  |  |  |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  |  |  |  |  |  |  | 3,600,000 | 1,100,000 |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  |  | $ 209,000,000 |  |  |  |  |  |  |
Product Warranty Term |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Advertising cost |  |  |  |  |  |  |  | $ 22,500,000 | 20,200,000 | 14,400,000 |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  | 4,500,000 | (2,200,000) |  |  |  |  |  |
Increase to cash flows provided by operations |  |  |  |  |  |  |  | 8,300,000 | 798,200,000 | 796,800,000 |  |  |  |  |
Increase to cash flows used in financing activities |  |  |  |  |  |  |  | (285,800,000) | 68,400,000 | $ 86,100,000 |  |  |  |  |
MRI Breast Coils [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | 9,600,000 |  |  |  |  |  |
Developed Technology Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization |  |  | 1,991,600,000 |  |  |  |  | 2,186,800,000 | 1,991,600,000 |  |  |  |  |  |
Developed Technology Rights [Member] | Cystic Fibrosis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,200,000
Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization |  |  | 141,600,000 |  |  |  |  | $ 156,400,000 | $ 141,600,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |
Defined contract term |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Transition services agreement term | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Accounts receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |
Minimum | Total revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |
Defined contract term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Transition services agreement term | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Investments | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Cap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate caps - derivative |  |  | 1,400,000 |  |  |  |  | $ 4,800,000 | $ 1,400,000 |  |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments |  |  |  |  | $ (25,100,000) |  |  |  |  |  |  |  |  |  |
Equity investment impairment charges |  |  | 1,100,000 |  |  | $ 7,800,000 |  | 0 |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (7,800,000) |  |  |  |  |  |
Cynosure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 994,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation of acquired software |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Short and long-term marketable securities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,900,000 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 683,500,000 |
Medicor Medical Supply |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 5,400,000 | $ 5,400,000 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,900,000 |  |
Gen-Probe Incorporated [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 3,700,000 |  |  |
Scenario, Forecast [Member] | Cynosure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation of acquired software |  |  |  |  |  |  | $ 5,900,000 |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Blood Screening Business | Developed Technology Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Intangible Assets | 154,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Blood Screening Business | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Intangible Assets | $ 387,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Medical Aesthetics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 0 |  |  |  |  | 683,500,000 | 0 |  | $ 683,500,000 |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 2,490,000,000 |  |  |  |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to cash flows provided by operations |  |  |  |  |  |  |  |  | 11,000,000 | $ 10,700,000 |  |  |  |  |
Increase to cash flows used in financing activities |  |  |  |  |  |  |  |  | $ 11,000,000 | $ 10,700,000 |  |  |  |  |
Forward foreign currency contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative contract period, or less |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + 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=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity and any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References No definition available. + Details
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