CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jan. 03, 2016	Dec. 28, 2014
Income Statement [Abstract]
Net sales	$ 329.2	$ 303.6
Cost of sales	141.3	135.5
Gross profit	187.9	168.1
Operating expenses:
Selling, general and administrative	69.3	60.1
Research and development costs	54.9	47.6
Amortization of intangible assets	25.4	23.6
Restructuring and severance charges	1.7	7.1
Total operating expenses	151.3	138.4
Operating income	36.6	29.7
Other expenses
Interest expense, net	(8.2)	(6.2)
Other expense, net	(0.6)	(0.4)
Total other expense	(8.8)	(6.6)
Income before income taxes	27.8	23.1
Provision for income taxes	4.1	3.4
Net income	$ 23.7	$ 19.7
Earnings per share:
Basic (USD per share)	$ 0.25	$ 0.21
Diluted (USD per share)	$ 0.25	$ 0.21
Weighted-average common shares outstanding:
Basic (in shares)	95.1	93.9
Diluted (in shares)	96.5	95.1
Net income	$ 23.7	$ 19.7
Other comprehensive income (loss), net of tax:
Translation adjustment	(3.7)	(1.7)
Unrealized actuarial loss on pension benefits	(0.1)	(0.1)
Other comprehensive loss, net of tax	(3.8)	(1.8)
Total comprehensive income	$ 19.9	$ 17.9