Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Income Statement [Abstract]
Net revenue	$ 1,068.5	$ 1,201.5
Cost of goods sold	626.6	694.9
Gross profit	441.9	506.6
Operating expenses:
Research and development	176.4	153.1
Selling, general, and administrative	82.6	78.8
Amortization of intangibles	0.2	0.2
Restructuring, impairment, and other charges	1.6	16.2
Total operating expenses	260.8	248.3
Operating income	181.1	258.3
Interest expense	(6.8)	(10.0)
Other income, net	16.1	3.4
Income before income taxes	190.4	251.7
Provision for income taxes	28.4	20.4
Net income	$ 162.0	$ 231.3
Earnings per share:
Basic (in dollars per share)	$ 1.01	$ 1.45
Diluted (in dollars per share)	$ 1.00	$ 1.44
Weighted average shares:
Basic (in shares)	160.4	159.9
Diluted (in shares)	161.4	161.0
Common stock, dividends declared (in dollars per share)	$ 0.70	$ 0.68