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Summary of Significant Accounting Policies - Schedule of Unrealized Loss Recognized in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Accounting Policies [Abstract] |  |  |
Loss recognized in other comprehensive income, net | $ 0.8 | $ (3.4) | $ (3.9)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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