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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Mar. 29, 2014 | Mar. 30, 2013
Fair Value Measurement [Line Items] |  |  |  |  |
Impairment charge |  |  | $ 700,000 | $ 28,600,000 |
Impairment charge allocated to intangible assets |  |  |  | 27,100,000 |
Impairment charge allocated to property and equipment |  |  |  | 33,308,000 | 47,000
Asset impairment charge |  | 3,100,000 |  |  |
Cost-method equity investments in non-publicly traded securities | 8,700,000 |  | 12,600,000 | 8,700,000 |
Other-than-temporary impairment charges | 3,000,000 |  |  | 3,700,000 |
Fair value of Senior Notes | 1,060,000,000 |  |  | 1,060,000,000 |
Property and equipment [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Impairment charge allocated to property and equipment |  |  |  | 1,500,000 |
Cost of product revenues [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Impairment charge allocated to property and equipment |  |  |  | 300,000 |
General and Administrative Expenses [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Impairment charge allocated to property and equipment |  |  |  | 1,200,000 |
Level Three Investments [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Other-than-temporary impairment charges |  |  |  | 1,700,000 |
Credit Agreement [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Borrowed principal under credit agreement | $ 2,080,000,000 |  |  | $ 2,080,000,000 |

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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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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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