Derivative Instruments and Hedging Activities - Gains (Losses) Related to Foreign Currency Forward Exchange Contracts that are Not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Net Earnings on Derivative	$ (5.5)	$ 0.0	$ 0.0
Not Designated as Hedging Instrument \| Foreign Exchange Forward \| Selling, general and administrative expenses
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Net Earnings on Derivative	$ 19.5	$ (10.9)	$ (5.3)

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

Name:	us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration