CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Cash flows from operating activities:
Net earnings	$ 269.4	$ 292.2	$ 150.3
Adjustments to reconcile net earnings to net cash provided by operating activities:
Share-based compensation expense	43.9	47.9	45.9
Depreciation	60.6	53.8	52.1
Amortization of intangible assets and inventory step-up	38.3	39.2	20.6
Deferred taxes	26.9	18.9	48.0
Provision to allowance for doubtful accounts	14.5	6.6	4.0
Gain on equity investments, net	(41.5)	(23.8)	0.0
Impairment charges	58.3	50.6	22.4
Write-off of in-process research and development related to acquisition-related activities	0.0	20.8	0.0
Change in fair value of contingent consideration	(0.3)	18.6	0.0
Other, net	2.4	(0.3)	9.7
Changes in assets and liabilities, net of effects of acquisitions:
Trade and unbilled receivables	35.2	(111.7)	(76.1)
Inventories	39.8	(106.9)	(16.4)
Prepaid expenses and other assets	4.8	(40.4)	(3.9)
Accounts payable	(66.9)	49.7	21.9
Accrued liabilities and other long-term liabilities	(12.5)	(14.5)	175.6
Deferred revenues	11.2	71.1	0.8
Net cash provided by operating activities	484.1	371.8	454.9
Cash flows from investing activities:
Purchases of property, plant and equipment	(84.3)	(58.0)	(47.7)
Acquisitions, net of cash acquired	(36.2)	(576.2)	(109.0)
Purchase of equity and notes receivable in privately-held companies	(26.3)	(32.8)	(10.1)
Sale of equity investments	9.2	29.9	0.0
Sale of available-for-sale securities	0.0	8.5	15.9
Investment in available-for-sale securities	0.0	0.0	(17.8)
Other, net	(2.7)	(3.1)	(6.0)
Net cash used in investing activities	(140.3)	(631.7)	(174.7)
Cash flows from financing activities:
Repurchases of common stock	(86.2)	(166.7)	(181.9)
Proceeds from issuance of common stock to employees	76.0	63.4	60.7
Tax withholdings on vesting of equity awards	(12.8)	(14.5)	(11.6)
Borrowings under credit facility agreement	110.5	636.5	503.3
Repayments under credit facility agreement	(110.5)	(636.5)	(503.3)
Net borrowings (repayments) under the credit facility agreements with maturities less than 90 days	(55.0)	410.0	(350.0)
Repayment of acquired debt	0.0	(16.8)	0.0
Payment of contingent consideration	(14.0)	(1.0)	(0.5)
Other	(1.1)	4.8	(3.7)
Net cash provided by (used in) financing activities	(93.1)	279.2	(487.0)
Effects of exchange rate changes on cash and cash equivalents	(9.0)	8.4	4.7
Net decrease in cash and cash equivalents	241.7	27.7	(202.1)
Cash and cash equivalents at beginning of period	544.1	516.4	718.5
Cash, cash equivalents and restricted cash at end of period	$ 785.8	$ 544.1	$ 516.4