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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
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Sep. 24, 2016 USD ($) Customer | Mar. 26, 2016 USD ($) | Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($) Customer | Sep. 27, 2014 USD ($) | Mar. 29, 2014 USD ($) | Dec. 28, 2013 USD ($) | Sep. 24, 2016 USD ($) Customer | Sep. 26, 2015 USD ($) Customer | Sep. 27, 2014 USD ($) | Jun. 25, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash equivalent maturity period |  |  |  |  |  |  |  | three months or less |  |  |
Equity investment impairment charges |  |  |  |  |  |  |  | $ (1,100,000) | $ (7,800,000) | $ (6,900,000) |
Number of customers with balance greater than specified percentage | Customer | 0 |  |  | 0 |  |  |  | 0 | 0 |  |
Impairment charges on tangible assets |  |  |  |  |  |  | $ 3,100,000 |  |  |  |
Impairment charges on long lived assets |  |  |  |  |  | $ 28,600,000 |  |  |  |  |
Acquired In-process research and development charges |  |  |  |  | $ 5,100,000 |  |  |  |  |  |
Accumulated Amortization | $ 2,681,500,000 |  |  | $ 2,299,600,000 |  |  |  | $ 2,681,500,000 | $ 2,299,600,000 |  |
Indefinite-lived Intangible Assets Acquired |  | $ 4,800,000 |  |  |  |  |  |  |  |  |
Sensitivity Change To Fair Value By Percent |  |  |  |  |  |  |  | 10.00% |  |  |
Goodwill | 2,803,100,000 |  |  | 2,808,200,000 |  |  |  | $ 2,803,100,000 | 2,808,200,000 |  |
Percentage of equity ownership at which cost-method investments would not qualify for cost-method accounting |  |  |  |  |  |  |  | 20.00% |  |  |
Other-than-temporary impairment charges |  |  |  |  |  |  |  |  | 0 | 6,900,000 |
Gross Unrealized Gains |  |  |  | 7,200,000 |  |  |  |  | 7,200,000 |  |
Interest Rate Cap Agreements Aggregate Premium Payable |  |  |  |  |  |  |  | $ 0 | 13,200,000 | 0 |
Principal Amount Of Borrowings | 1,000,000,000 |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Interest Payment Duration |  |  |  |  |  |  |  | three-year |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  |  |  |  |  |  | $ 3,900,000 | 0 | 0 |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  |  |  |  |  |  | 6,900,000 |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments |  |  |  |  |  |  |  | 1,500,000 |  |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  |  |  |  |  |  |  | 1,100,000 |  |  |
Notional Amount | 165,000,000 |  |  |  |  |  |  | $ 165,000,000 |  |  |
Product Warranty Term |  |  |  |  |  |  |  | 1 year |  |  |
Advertising cost |  |  |  |  |  |  |  | $ 20,200,000 | 14,400,000 | $ 14,100,000 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  | (2,200,000) | 17,400,000 |  |
Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  | 27,600,000 |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  | 600,000 |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  | 27,000,000 |  |
MRI Breast Coils [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges on tangible assets |  |  |  |  |  | 28,600,000 |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | 9,600,000 |  |
MRI Breast Coils [Member] | Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges on long lived assets |  |  |  |  |  | 1,500,000 |  |  |  |  |
Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization | 1,991,600,000 |  |  | 1,698,500,000 |  |  |  | 1,991,600,000 | 1,698,500,000 |  |
Developed Technology [Member] | MRI Breast Coils [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | 26,600,000 |  |  |  |  |
Developed Technology [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 |  |  | 131,500,000 |  |  |  | $ 141,600,000 | $ 131,500,000 |  |
Trade Names [Member] | MRI Breast Coils [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | 500,000 |  |  |  |  |
Finite-Lived Intangible Assets [Member] | MRI Breast Coils [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges on long lived assets |  |  |  |  |  | 27,100,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  |  | 2 years |  |  |
Defined contract term |  |  |  |  |  |  |  | 3 years |  |  |
Minimum [Member] | Accounts receivable [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  | 10.00% | 10.00% |  |
Minimum [Member] | Total revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  |  | 30 years |  |  |
Defined contract term |  |  |  |  |  |  |  | 5 years |  |  |
Cost of Sales [Member] | MRI Breast Coils [Member] | Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges on long lived assets |  |  |  |  |  | 300,000 |  |  |  |  |
General and Administrative Expense [Member] | MRI Breast Coils [Member] | Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges on long lived assets |  |  |  |  |  | $ 1,200,000 |  |  |  |  |
Interest Rate Cap [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 1,400,000 |  |  | 6,900,000 |  |  |  | $ 1,400,000 | $ 6,900,000 |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Unrealized Gains | 0 |  |  |  | $ 10,200,000 |  |  | 0 |  | $ 10,200,000 |
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 |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (7,800,000) |  |
Pension in Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  | 0 | 0 |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  | $ 0 | $ 9,600,000 |  |

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