Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 28, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes to the carrying amount of goodwill are as follows (in millions):

	As of
	September 28, 2018		September 29, 2017
Goodwill at beginning of the period	$	883.0	$	873.3
Goodwill recognized through business combinations (Note 3)	306.8		9.7
Goodwill impairment	—		—
Goodwill at the end of the period	$	1,189.8	$	883.0

Schedule Of Intangible Assets Excluding Goodwill

Intangible assets consist of the following (in millions):

		As of							As of
	Weighted average amortization period (years)	September 28, 2018							September 29, 2017
		Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships	3.4	$	31.7	$	(13.2	)	$	18.5	$	29.7	$	(14.6	)	$	15.1
Developed technology and other	5.3	89.9		(23.5		)	66.4		59.9		(20.6		)	39.3
Trademarks	3.0	1.6		(0.8		)	0.8		1.6		(0.3		)	1.3
Capitalized software	3.0	18.0		(6.0		)	12.0		12.1		—			12.1
IPR&D		46.0		—			46.0		$	—	—			—
Total intangible assets		$	187.2	$	(43.5	)	$	143.7	$	103.3	$	(35.5	)	$	67.8

Schedule of Expected Amortization Expense

Annual amortization expense for the next five fiscal years related to intangible assets is expected to be as follows (in millions):

	2019		2020		2021		2022		2023		Thereafter
Amortization expense, cost of goods sold	$	24.8	$	22.5	$	0.1	$	0.1	$	0.1	$	1.9
Amortization expense, operating expense	22.6		11.8		9.0		1.0		1.0		2.8
Total amortization expense	$	47.4	$	34.3	$	9.1	$	1.1	$	1.1	$	4.7