CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Income Statement [Abstract]
Net sales	$ 431,400	$ 317,100	$ 1,204,900	$ 916,800
Cost of sales	164,500	145,000	549,600	407,400
Gross profit	266,900	172,100	655,300	509,400
Operating expenses:
Selling, general and administrative	82,900	66,700	265,800	187,700
Research and development costs	83,000	52,300	225,700	146,300
Amortization of intangible assets	44,900	24,800	115,566	71,084
Restructuring and severance charges	4,900	3,100	58,300	14,000
Total operating expenses	215,700	146,900	665,400	419,100
Operating income	51,200	25,200	(10,100)	90,300
Other income (expense)
Interest expense, net	(46,800)	(7,400)	(93,000)	(19,500)
Other expense, net	(5,300)	(600)	(83,700)	(1,400)
Gain on divestiture	125,500	0	125,500	0
Total other income (expense)	73,400	(8,000)	(51,200)	(20,900)
Income (loss) before income taxes	124,600	17,200	(61,300)	69,400
Provision for income taxes	9,400	2,500	11,800	10,200
Net income (loss)	$ 115,200	$ 14,700	$ (73,100)	$ 59,200
Earnings (loss) per share:
Basic (USD per share)	$ 1.03	$ 0.16	$ (0.69)	$ 0.63
Diluted (USD per share)	$ 1.00	$ 0.15	$ (0.69)	$ 0.62
Weighted-average common shares outstanding:
Basic (in shares)	112.1	94.5	105.3	94.1
Diluted (in shares)	114.6	96.4	105.3	95.6
Net income (loss)	$ 115,200	$ 14,700	$ (73,100)	$ 59,200
Other comprehensive income (loss), net of tax:
Translation adjustment	200	400	2,800	(1,400)
Unrealized actuarial loss on pension benefits	(100)	(100)	(200)	(200)
Other comprehensive income (loss), net of tax	100	300	2,600	(1,600)
Total comprehensive income (loss)	$ 115,300	$ 15,000	$ (70,500)	$ 57,600