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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |  | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Sep. 29, 2012 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012 | Mar. 29, 2014 Property, Plant and Equipment [Member] | Sep. 27, 2014 Credit Agreement [Member] | Aug. 01, 2012 Credit Agreement [Member] | Sep. 27, 2014 Senior Notes [Member] | Sep. 28, 2013 Senior Notes [Member] | Sep. 28, 2013 Fair Value, Inputs, Level 3 [Member] | Sep. 27, 2014 Diagnostics [Member] | Sep. 27, 2014 Diagnostics [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost-method equity investments |  |  |  | $ 1,500,000 |  |  | $ 1,500,000 |  |  |  |  |  |  | $ 1,500,000 |  |
Impairment of goodwill |  |  |  | 1,100,000,000 | 5,800,000 | 0 | 1,117,400,000 | 5,800,000 |  |  |  |  |  |  | 0 |
Impairment charge |  | 28,600,000 |  | 700,000 |  |  | 3,700,000 | 6,500,000 |  |  |  |  |  |  |  |
Impairment charge allocated to intangible assets |  | 27,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charges |  |  |  |  |  | 38,400,000 | 9,400,000 | 16,900,000 | 1,500,000 |  |  |  |  |  |  | 5,100,000
Asset impairment charge |  |  | 3,100,000 |  |  |  | 5,000,000 | 6,500,000 |  |  |  |  |  |  |  |
Cost-method equity investments in non-publicly traded securities |  |  |  | 12,600,000 |  | 5,200,000 | 12,600,000 |  |  |  |  |  |  |  |  |
Other-than-temporary impairment charges | 6,900,000 |  |  |  |  | 6,400,000 |  |  |  |  |  |  |  |  |  |
Borrowed principal under credit agreement |  |  |  |  |  |  |  |  |  | 2,050,000,000 | 2,500,000,000 |  |  |  |  |
Fair value of debt instrument |  |  |  |  |  |  |  |  |  |  |  | $ 1,030,000,000 | $ 1,050,000,000 |  |  |

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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=8077374&loc=d3e2420-110228 + Details
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