Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Revenues:
Product Revenue	$ 667.8	$ 645.0	$ 1,350.9	$ 1,295.7
Service Revenue	150.6	144.3	298.2	284.7
Revenues	818.4	789.3	1,649.1	1,580.4
Costs of revenues:
Cost of Goods and Services Sold	232.9	217.1	465.0	430.8
Cost, Amortization	80.4	79.8	161.4	159.6
Cost Of Goods Sold Impairment Of Intangible Assets	374.6	0.0	374.6	0.0
Cost of service	88.1	77.3	171.6	150.4
Gross profit	42.4	415.1	476.5	839.6
Operating expenses:
Research and development	57.3	56.8	110.5	111.6
Selling and marketing	133.5	130.5	279.5	270.0
General and administrative	89.9	83.8	168.5	161.7
Amortization of acquired intangible assets	14.1	14.7	28.2	29.1
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	69.2	46.0	69.2	46.0
Goodwill, Impairment Loss	0.0	685.7	0.0	685.7
Restructuring charges	1.6	1.8	3.3	5.6
Operating expenses	365.6	1,019.3	659.2	1,309.7
Loss from operations	(323.2)	(604.2)	(182.7)	(470.1)
Interest income	0.8	2.1	2.1	2.9
Interest expense	(34.8)	(38.9)	(70.9)	(79.9)
Debt extinguishment losses	0.0	(44.9)	(0.8)	(45.9)
Other income (expense), net	3.5	(5.1)	2.9	(2.2)
Loss before income taxes	(353.7)	(691.0)	(249.4)	(595.2)
Benefit for income taxes	(81.1)	(9.6)	(75.4)	(320.5)
Net loss	$ (272.6)	$ (681.4)	$ (174.0)	$ (274.7)
Net loss per common share:
Basic	$ (1.01)	$ (2.46)	$ (0.64)	$ (0.99)
Diluted	$ (1.01)	$ (2.46)	$ (0.64)	$ (0.99)
Weighted average number of shares outstanding:
Basic	269,235	277,114	269,913	276,985
Diluted	269,235	277,114	269,913	276,985