CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 30, 2012	Jan. 01, 2012
Income Statement [Abstract]
Net sales	$ 247,598	$ 240,920
Cost of sales	105,025	115,184
Gross profit	142,573	125,736
Operating expenses:
Selling, general and administrative	51,353	54,716
Research and development costs	43,176	39,601
Amortization of intangible assets	21,710	24,862
Restructuring and severance charges	850	7,225
Total operating expenses	117,089	126,404
Operating income (loss)	25,484	(668)
Other income (expenses):
Interest expense	(8,404)	(11,980)
Interest income	43	141
Other, net	54	(32,404)
Total other expense	(8,307)	(44,243)
Income (loss) before income taxes	17,177	(44,911)
Provision (benefit) for income taxes	2,963	(309)
Net income (loss)	14,214	(44,602)
Earnings (loss) per share:
Basic	$ 0.16	$ (0.52)
Diluted	$ 0.16	$ (0.52)
Weighted-average common shares outstanding:
Basic	88,535	85,217
Diluted	90,062	85,217
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Translation adjustment, net of tax	230	(291)
Unrealized actuarial loss on pension benefits, net of tax	(44)	0
Other comprehensive income (loss)	186	(291)
Total comprehensive income (loss)	$ 14,400	$ (44,893)