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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | Mar. 26, 2016 | Sep. 26, 2015
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Cost Method Investments | $ 3.5 | $ 4.2
Borrowed principal under credit agreement | 1,000.0 |
Credit Agreement |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Borrowed principal under credit agreement | 1,620.0 |
Senior Notes |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value of debt instrument | $ 1,040.0 |

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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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