CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Millions	6 Months Ended
	Mar. 31, 2017 USD ($)		Apr. 01, 2016 USD ($)
Statement of Cash Flows [Abstract]
Net earnings	$ 77.0		$ 186.0
Adjustments to reconcile net earnings to net cash provided by operating activities:
Share-based compensation expense	23.6		23.8
Tax benefits from exercises of share-based payment awards	0.7		0.8
Excess tax benefits from share-based compensation	(1.2)		(1.6)
Depreciation	31.9		31.1
Amortization of intangible assets	9.1		6.8
Deferred taxes	(5.8)		0.6
Provision for doubtful accounts receivable	38.8		3.6
Impairment charges	38.3		0.0
Other, net	(0.2)		(0.1)
Changes in assets and liabilities:
Accounts receivable	(21.0)		(94.4)
Inventories	(20.3)		(39.6)
Prepaid expenses and other assets	(55.0)		(15.6)
Accounts payable	(9.9)		(13.6)
Accrued liabilities and other long-term liabilities	(26.0)		1.8
Deferred revenues	34.4		19.5
Net cash provided by operating activities	114.4		109.1
Cash flows from investing activities:
Purchases of property, plant and equipment	(32.1)		(45.9)
Issuance of notes receivable	(11.5)		(6.2)
Investment in privately-held company	(5.0)		0.0
Sale of available-for-sale securities	0.0		8.6
Investment in available-for-sale securities	(1.1)		(1.0)
Amounts paid to deferred compensation plan trust account	(4.4)		(2.9)
Other	0.9		0.9
Net cash used in investing activities	(53.2)		(46.5)
Cash flows from financing activities:
Repurchases of common stock	(222.3)		(248.7)
Proceeds from issuance of common stock to employees	25.4		21.2
Excess tax benefits from share-based compensation	1.2		1.6
Employees' taxes withheld and paid for restricted stock and restricted stock units	(10.5)		(10.7)
Cash received from Varex Imaging Corporation	200.0		0.0
Cash and cash equivalents contributed to Varex Imaging Corporation	(81.3)		0.0
Borrowings under credit facility agreement	90.0		83.0
Repayments under credit facility agreement	(100.0)		(108.0)
Net (repayments) borrowings under the credit facility agreements with maturities less than 90 days	(107.0)		322.0
Contingent consideration and hold back	(0.5)		(3.7)
Capital contribution from noncontrolling interest holders	0.0		0.5
Net cash (used in) provided by financing activities	(205.0)		57.2
Effects of exchange rate changes on cash and cash equivalents	7.3		(4.2)
Net (decrease) increase in cash and cash equivalents	(136.5)		115.6
Cash and cash equivalents at beginning of period	843.5	[1]	845.5	[1]
Cash and cash equivalents at end of period	707.0	[1]	$ 961.1	[1]
Cash and cash equivalents classified as discontinued operations	$ 1.5

[1] Cash and cash equivalents includes $32.1 million at September 30, 2016 and $1.5 million at March 31, 2017 classified as discontinued operations. See Note 2, "Discontinued Operations" for more information.