The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Stockholders' Equity and Noncontrolling Interests - Schedule of Amounts Reclassified Out of Other Comprehensive Earnings (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Other income, net									$ 28.3	$ 4.2	$ 2.4
Revenues	$ 878.9	$ 825.8	$ 779.4	$ 741.0	$ 801.6	$ 709.1	$ 729.9	$ 678.5	3,225.1	2,919.1	2,619.3
Operating earnings									386.2	437.4	297.8
Net Unrealized Gains (Losses) Defined Benefit Pension and Post-Retirement Benefit Plans
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Other income, net									(1.5)	(1.7)	(3.4)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Operating earnings									(1.3)	(2.6)	(3.4)
Reclassification out of Accumulated Other Comprehensive Income \| Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Revenues									$ 0.2	$ (0.9)	$ 0.0