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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2015 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014 | Aug. 01, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Investments, Fair Value Disclosure | $ 27.7 |  |  | $ 2.6 | $ 27.7 |  |
Impairment charge |  | $ 28.6 |  |  |  |  |
Impairment charge allocated to intangible assets |  | 27.1 |  |  |  |  |
Non-cash impairment charges |  |  |  | 0.0 | 0.0 | $ 38.4 |
Asset impairment charge |  |  | $ 3.1 |  |  |  |
Cost-method equity investments in non-publicly traded securities | 4.2 |  |  | 3.5 | 4.2 |  |
Other-than-temporary impairment charges |  |  |  |  |  | $ 6.9 |
Borrowed principal under credit agreement |  |  |  | 1,000.0 |  |  |
Property, Plant and Equipment [Member] |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Non-cash impairment charges |  | $ 1.5 |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Borrowed principal under credit agreement |  |  |  | 1,410.0 |  |  | $ 2,500.0
Accounts Receivable Securitization [Member] |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Borrowed principal under credit agreement |  |  |  | 200.0 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Fair value of debt instrument | 1,030.0 |  |  | 1,060.0 | 1,030.0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Investments, Fair Value Disclosure | 0.0 |  |  | $ 0.0 | $ 0.0 |  |
Diagnostics [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Non-cash impairment charges | $ 5.1 |  |  |  |  |  |

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