Taxes on Earnings - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Sep. 27, 2019	Sep. 28, 2018
Income Tax Disclosure [Abstract]
Deferred revenues	$ 21.1	$ 13.2
Deferred compensation	33.9	34.6
Product warranty	5.5	7.5
Inventory adjustments	6.0	7.6
Share-based compensation	12.4	13.7
Environmental reserve	1.8	2.2
Accruals and reserves	11.8	12.1
Net operating loss carryforwards	120.7	132.0
Other	37.1	24.2
Total deferred tax assets, gross	250.3	247.1
Valuation allowance	(99.7)	(101.6)
Total deferred tax assets	150.6	145.5
Tax-deductible goodwill	(20.7)	(31.6)
Intangibles	(61.7)	(6.7)
Property, plant and equipment	(7.1)	(9.4)
Unremitted earnings of foreign subsidiaries	(34.1)	(20.4)
Other	(17.6)	(6.6)
Total deferred tax liabilities	(141.2)	(74.7)
Deferred tax assets	84.7	102.2
Net current deferred tax liabilities (included in accrued liabilities)	(75.3)	(31.4)
Net deferred tax assets	$ 9.4	$ 70.8