CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017	Sep. 29, 2017
Statement of Cash Flows [Abstract]
Net earnings	$ 72.5	$ 69.9	$ 33.5	$ 140.6
Adjustments to reconcile net earnings to net cash provided by operating activities:
Share-based compensation expense			34.0	32.7
Depreciation			38.3	45.2
Amortization of intangible assets			15.2	13.3
Deferred taxes			50.1	(15.9)
Impairment charges	11.0	0.0	22.1	38.3
Loss on hedges related to acquisition-related activities			5.5	0.0
Provision for doubtful accounts receivable			2.7	38.5
Other, net			1.3	(0.7)
Changes in assets and liabilities:
Trade and unbilled receivables			10.8	25.8
Inventories			(48.5)	(20.2)
Prepaid expenses and other assets			(29.8)	(49.0)
Accounts payable			27.8	(0.6)
Accrued liabilities and other long-term liabilities			150.0	(28.1)
Deferred revenues			33.7	49.5
Net cash provided by operating activities			346.7	269.4
Cash flows from investing activities:
Purchases of property, plant and equipment			(30.8)	(40.4)
Acquisitions, net of cash acquired			(58.7)	(0.4)
Issuance of notes receivable			0.0	(18.2)
Principal payments on notes receivable			6.3	0.0
Investment in available-for-sale securities			(6.0)	(9.1)
Sale of available-for-sale securities			8.0	0.0
Loans to CPTC			(5.3)	0.0
Purchase of foreign currency option related to acquisition-related activities			(5.5)	0.0
Investment in privately-held companies			(10.1)	(7.2)
(Increase) decrease in restricted cash			(6.7)	0.1
Other, net			(1.1)	(3.7)
Net cash used in investing activities			(109.9)	(78.9)
Cash flows from financing activities:
Repurchases of common stock			(131.9)	(269.1)
Proceeds from issuance of common stock to employees			57.1	56.7
Employees' taxes withheld and paid for restricted stock, restricted stock units and performance units			(11.5)	(10.6)
Cash received from Varex Imaging Corporation			0.0	200.0
Cash and cash equivalents contributed to Varex Imaging Corporation			0.0	(54.2)
Borrowings under credit facility agreement			503.3	148.0
Repayments under credit facility agreement			(503.3)	(185.5)
Net repayments under the credit facility agreements with maturities less than 90 days			(331.7)	(262.0)
Other			(3.6)	1.0
Net cash used in financing activities			(421.6)	(375.7)
Effects of exchange rate changes on cash and cash equivalents			4.6	1.7
Net decrease in cash and cash equivalents			(180.2)	(183.5)
Cash and cash equivalents at beginning of period			716.2	843.5	$ 843.5
Cash and cash equivalents at end of period	$ 536.0	$ 660.0	$ 536.0	$ 660.0	$ 716.2