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Summary of Significant Accounting Policies - Summary of Marketable Securities (Detail) - Equity securities - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Schedule Of Marketable Securities [Line Items]
Cost	$ 0.7	$ 2.4	$ 16.1
Gross Unrealized Gains	0.0	0.0	7.2
Gross Unrealized Losses	(0.6)	(0.3)	(0.3)
Other than temporary impairment	0.0	(1.1)	(7.8)
Fair Value	$ 0.1	$ 1.0	$ 15.2

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Other than temporary impairment

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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