CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Oct. 02, 2011
Income Statement [Abstract]
Net sales	$ 975,944	$ 1,012,495	$ 835,854
Cost of sales	418,756	459,872	394,683
Gross profit	557,188	552,623	441,171
Operating expenses:
Selling, general and administrative	202,468	212,338	187,529
Research and development costs	170,573	168,516	114,155
Amortization of intangible assets	84,819	104,756	62,425
Restructuring and severance charges	9,901	8,666	22,081
Total operating expenses	467,761	494,276	386,190
Operating income	89,427	58,347	54,981
Other income (expenses):
Interest expense	(30,442)	(39,861)	(16,654)
Interest income	204	308	383
Other, net	(3,126)	(33,519)	(16,661)
Total other expense	(33,364)	(73,072)	(32,932)
Income (loss) before income taxes	56,063	(14,725)	22,049
Provision (benefit) for income taxes	12,389	14,950	(33,681)
Net income (loss)	43,674	(29,675)	55,730
Earnings (loss) per share:
Basic	$ 0.49	$ (0.35)	$ 0.66
Diluted	$ 0.48	$ (0.35)	$ 0.65
Weighted-average common shares outstanding:
Basic	89,508	85,837	83,916
Diluted	91,328	85,837	85,747
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Translation adjustment	913	(373)	332
Unrealized actuarial loss on pension benefits	(218)	(1,156)	0
Other comprehensive income (loss)	695	(1,529)	332
Total comprehensive income (loss)	$ 44,369	$ (31,204)	$ 56,062