CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Income Statement [Abstract]
Net sales	$ 242,630	$ 259,195	$ 725,561	$ 749,421
Cost of sales	104,318	114,602	311,211	347,224
Gross profit	138,312	144,593	414,350	402,197
Operating expenses:
Selling, general and administrative	48,845	51,535	152,514	158,222
Research and development costs	42,192	43,950	127,324	125,739
Amortization of intangible assets	21,045	26,049	63,865	77,383
Restructuring and severance charges	981	1,739	8,092	9,083
Total operating expenses	113,063	123,273	351,795	370,427
Operating income (loss)	25,249	21,320	62,555	31,770
Other income (expenses):
Interest expense, net	(7,203)	(8,918)	(23,308)	(30,951)
Other, net	188	(115)	(3,361)	(33,554)
Total other expense	(7,015)	(9,033)	(26,669)	(64,505)
Income (loss) before income taxes	18,234	12,287	35,886	(32,735)
Provision (benefit) for income taxes	(45)	4,161	6,298	8,533
Net income (loss)	18,279	8,126	29,588	(41,268)
Earnings (loss) per share:
Basic	$ 0.20	$ 0.09	$ 0.33	$ (0.48)
Diluted	$ 0.20	$ 0.09	$ 0.33	$ (0.48)
Weighted-average common shares outstanding:
Basic	89,809	86,000	89,235	85,652
Diluted	91,682	87,941	90,810	85,652
Other comprehensive income (loss), net of tax:
Translation adjustment, net of tax	143	(416)	322	(531)
Unrealized actuarial loss on pension benefits, net of tax	(43)	0	(129)	0
Other comprehensive income (loss)	100	(416)	193	(531)
Total comprehensive income (loss)	$ 18,379	$ 7,710	$ 29,781	$ (41,799)