Supplemental Guarantor Condensed Consolidating Financials - Schedule of Supplemental Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 29, 2012	Dec. 24, 2011	Mar. 24, 2011
Revenues:
Product sales	$ 535,202	$ 392,096
Service and other revenues	96,160	80,615
Total revenues	631,362	472,711
Costs and expenses:
Cost of product sales	223,493	131,944
Cost of product sales - amortization of intangible assets	75,287	46,171
Cost of service and other revenues	50,909	45,226
Research and development	51,509	28,342
Selling and marketing	94,443	77,460
General and administrative	54,391	46,495
Amortization of intangible assets	28,526	14,842
Contingent consideration - compensation expense	29,486	10,441
Contingent consideration - fair value adjustments	10,040	5,122
Gain on sale of intellectual property, net	(53,884)		(84,500)
Restructuring charges	3,933	(91)
Costs and expenses, total	568,133	405,952
Income from operations	63,229	66,759
Investment and interest income	260	662
Interest expense	(72,081)	(29,509)
Other income (expense), net	1,239	1,992
(Loss) income before income taxes	(7,353)	39,904
(Benefit) provision for income taxes	(10,471)	19,092
Net income	3,118	20,812
Parent Company [Member]
Revenues:
Product sales	98,043	105,761
Service and other revenues	77,960	73,428
Total revenues	176,003	179,189
Costs and expenses:
Cost of product sales	53,520	53,690
Cost of product sales - amortization of intangible assets	1,306	1,305
Cost of service and other revenues	38,378	39,235
Research and development	7,418	7,244
Selling and marketing	20,773	16,497
General and administrative	15,320	13,020
Amortization of intangible assets	678	677
Contingent consideration - compensation expense	29,486	10,441
Contingent consideration - fair value adjustments	10,040	5,122
Restructuring charges	221
Costs and expenses, total	177,140	147,231
Income from operations	(1,137)	31,958
Investment and interest income	131	578
Interest expense	(71,254)	(28,709)
Other income (expense), net	119	1,464
(Loss) income before income taxes	(72,141)	5,291
(Benefit) provision for income taxes	(11,747)	6,209
Equity in earnings (losses) of subsidiaries	63,512	21,730
Net income	3,118	20,812
Guarantor Subsidiaries [Member]
Revenues:
Product sales	379,771	250,448
Service and other revenues	21,141	14,526
Total revenues	400,912	264,974
Costs and expenses:
Cost of product sales	163,895	80,721
Cost of product sales - amortization of intangible assets	72,917	42,910
Cost of service and other revenues	15,591	13,730
Research and development	41,753	18,130
Selling and marketing	47,365	42,246
General and administrative	31,016	24,190
Amortization of intangible assets	26,649	13,859
Gain on sale of intellectual property, net	(53,884)
Restructuring charges	3,286
Costs and expenses, total	348,588	235,786
Income from operations	52,324	29,188
Investment and interest income	42	46
Interest expense	(314)	(327)
Other income (expense), net	(4,046)	21
(Loss) income before income taxes	48,006	28,928
(Benefit) provision for income taxes	(3,114)	8,571
Equity in earnings (losses) of subsidiaries	10,934	3,390
Net income	62,054	23,747
Non-Guarantor Subsidiaries [Member)
Revenues:
Product sales	133,075	102,534
Service and other revenues	9,872	7,262
Total revenues	142,947	109,796
Costs and expenses:
Cost of product sales	81,765	64,180
Cost of product sales - amortization of intangible assets	1,064	1,956
Cost of service and other revenues	9,753	6,862
Research and development	2,338	2,968
Selling and marketing	26,305	18,717
General and administrative	8,055	9,285
Amortization of intangible assets	1,199	306
Restructuring charges	426	(91)
Costs and expenses, total	130,905	104,183
Income from operations	12,042	5,613
Investment and interest income	87	38
Interest expense	(513)	(473)
Other income (expense), net	5,180	507
(Loss) income before income taxes	16,796	5,685
(Benefit) provision for income taxes	4,390	4,312
Equity in earnings (losses) of subsidiaries		557
Net income	12,406	1,930
Eliminations [Member]
Revenues:
Product sales	(75,687)	(66,647)
Service and other revenues	(12,813)	(14,601)
Total revenues	(88,500)	(81,248)
Costs and expenses:
Cost of product sales	(75,687)	(66,647)
Cost of service and other revenues	(12,813)	(14,601)
Costs and expenses, total	(88,500)	(81,248)
Other income (expense), net	(14)
(Loss) income before income taxes	(14)
Equity in earnings (losses) of subsidiaries	(74,446)	(25,677)
Net income	$ (74,460)	$ (25,677)