Supplemental Guarantor Condensed Consolidating Financials - Schedule of Supplemental Condensed Consolidating Statement of Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Dec. 29, 2012	Jun. 28, 2014	Jun. 29, 2013
Revenues:
Product	$ 529.3	$ 529.9		$ 1,562.8	$ 1,579.3
Service and other	103.3	96.2		307.3	290.9
Revenues	632.6	626.1		1,870.1	1,870.2
Costs of revenues:
Product	186.7	187.6		549.3	617.2
Amortization of intangible assets	80.5	76.0		234.1	227.0
Impairment of intangible assets	0	1.7		26.6	1.7
Service and other	52.6	51.0		159.6	153.5
Gross Profit	312.8	309.8		900.5	870.8
Operating expenses:
Research and development	52.5	47.8		151.1	148.9
Selling and marketing	83.0	82.9		245.0	265.4
General and administrative	64.7	60.5		194.6	179.7
Amortization of intangible assets	29.7	28.7		85.0	85.9
Contingent consideration – compensation expense	0	21.6		0	80.5
Impairment of intangible assets	0	0		0.5	0
Contingent consideration – fair value adjustments	0	0.5		0	11.3
Gain on sale of intellectual property	0	0	(53.9)	0	(53.9)
Restructuring and divestiture charges	6.7	6.7		36.6	23.1
Operating expenses	236.6	248.7		712.8	740.9
Income from operations	76.2	61.1		187.7	129.9
Interest income	0.3	0.3		0.8	0.8
Interest expense	(52.4)	(67.2)		(168.1)	(215.3)
Debt extinguishment loss	0	0		(7.4)	(3.2)
Other expense, net	(1.5)	(1.2)		(3.5)	(0.2)
Income (loss) before income taxes	22.6	(7.0)		9.5	(88.0)
Provision (benefit) for income taxes	11.3	4.0		20.3	(29.1)
Equity in earnings (losses) of subsidiaries	0	0		0	0
Net income (loss)	11.3	(11.0)		(10.8)	(58.9)
Eliminations [Member]
Revenues:
Product	(111.3)	(90.5)		(321.7)	(268.9)
Service and other	(12.4)	(12.4)		(40.0)	(40.7)
Revenues	(123.7)	(102.9)		(361.7)	(309.6)
Costs of revenues:
Product	(111.3)	(90.5)		(321.7)	(268.9)
Amortization of intangible assets	0	0		0	0
Impairment of intangible assets		0		0	0
Service and other	(12.4)	(12.4)		(40.0)	(40.7)
Gross Profit	0	0		0	0
Operating expenses:
Research and development	0	0		0	0
Selling and marketing	0	0		0	0
General and administrative	0	0		0	0
Amortization of intangible assets	0	0		0	0
Contingent consideration – compensation expense		0			0
Impairment of intangible assets				0
Contingent consideration – fair value adjustments		0			0
Gain on sale of intellectual property					0
Restructuring and divestiture charges	0	0		0	0
Operating expenses	0	0		0	0
Income from operations	0	0		0	0
Interest income	(1.1)	0		(2.5)	0
Interest expense	1.1	0		2.5	0
Debt extinguishment loss				0	0
Other expense, net	0	0		0	0
Income (loss) before income taxes	0	0		0	0
Provision (benefit) for income taxes	0	0		0	0
Equity in earnings (losses) of subsidiaries	(7.6)	91.3		(4.2)	15.4
Net income (loss)	(7.6)	91.3		(4.2)	15.4
Parent/Issuer [Member]
Revenues:
Product	128.4	106.5		356.8	305.2
Service and other	88.2	81.4		262.7	240.5
Revenues	216.6	187.9		619.5	545.7
Costs of revenues:
Product	61.5	57.7		172.4	163.7
Amortization of intangible assets	1.4	1.3		4.2	4.0
Impairment of intangible assets		0		0	0
Service and other	46.8	39.1		140.3	118.1
Gross Profit	106.9	89.8		302.6	259.9
Operating expenses:
Research and development	7.7	8.0		23.0	22.7
Selling and marketing	16.8	17.9		52.6	59.1
General and administrative	15.8	20.0		45.5	52.0
Amortization of intangible assets	0.6	0.8		2.4	2.2
Contingent consideration – compensation expense		21.6			80.5
Impairment of intangible assets				0
Contingent consideration – fair value adjustments		0.5			11.3
Gain on sale of intellectual property					0
Restructuring and divestiture charges	1.0	0.6		7.6	0.9
Operating expenses	41.9	69.4		131.1	228.7
Income from operations	65.0	20.4		171.5	31.2
Interest income	0.1	0.1		0.3	0.4
Interest expense	(52.6)	(66.3)		(168.0)	(212.9)
Debt extinguishment loss				(7.4)	(3.2)
Other expense, net	1.3	178.1		7.9	179.8
Income (loss) before income taxes	13.8	132.3		4.3	(4.7)
Provision (benefit) for income taxes	6.8	50.9		5.0	24.3
Equity in earnings (losses) of subsidiaries	4.3	(92.4)		(10.1)	(29.9)
Net income (loss)	11.3	(11.0)		(10.8)	(58.9)
Guarantor Subsidiaries [Member]
Revenues:
Product	386.4	399.1		1,154.0	1,177.7
Service and other	14.4	15.9		47.4	56.5
Revenues	400.8	415.0		1,201.4	1,234.2
Costs of revenues:
Product	147.3	143.8		431.7	478.1
Amortization of intangible assets	75.3	73.7		224.0	219.8
Impairment of intangible assets		0		0	0
Service and other	5.9	14.8		27.5	46.2
Gross Profit	172.3	182.7		518.2	490.1
Operating expenses:
Research and development	42.9	37.2		121.7	118.8
Selling and marketing	43.4	43.5		126.8	136.2
General and administrative	37.8	31.3		114.9	101.0
Amortization of intangible assets	26.8	26.7		77.9	80.1
Contingent consideration – compensation expense		0			0
Impairment of intangible assets				0
Contingent consideration – fair value adjustments		0			0
Gain on sale of intellectual property					(53.9)
Restructuring and divestiture charges	2.9	3.7		15.0	17.7
Operating expenses	153.8	142.4		456.3	399.9
Income from operations	18.5	40.3		61.9	90.2
Interest income	1.1	0		2.3	0.1
Interest expense	(0.3)	(0.3)		(0.8)	(0.9)
Debt extinguishment loss				0	0
Other expense, net	(3.0)	(179.2)		(12.4)	(186.3)
Income (loss) before income taxes	16.3	(139.2)		51.0	(96.9)
Provision (benefit) for income taxes	3.6	(49.9)		9.9	(61.1)
Equity in earnings (losses) of subsidiaries	3.3	1.1		14.3	14.5
Net income (loss)	16.0	(88.2)		55.4	(21.3)
Non-Guarantor Subsidiaries [Member]
Revenues:
Product	125.8	114.8		373.7	365.3
Service and other	13.1	11.3		37.2	34.6
Revenues	138.9	126.1		410.9	399.9
Costs of revenues:
Product	89.2	76.6		266.9	244.3
Amortization of intangible assets	3.8	1.0		5.9	3.2
Impairment of intangible assets		1.7		26.6	1.7
Service and other	12.3	9.5		31.8	29.9
Gross Profit	33.6	37.3		79.7	120.8
Operating expenses:
Research and development	1.9	2.6		6.4	7.4
Selling and marketing	22.8	21.5		65.6	70.1
General and administrative	11.1	9.2		34.2	26.7
Amortization of intangible assets	2.3	1.2		4.7	3.6
Contingent consideration – compensation expense		0			0
Impairment of intangible assets				0.5
Contingent consideration – fair value adjustments		0			0
Gain on sale of intellectual property					0
Restructuring and divestiture charges	2.8	2.4		14.0	4.5
Operating expenses	40.9	36.9		125.4	112.3
Income from operations	(7.3)	0.4		(45.7)	8.5
Interest income	0.2	0.2		0.7	0.3
Interest expense	(0.6)	(0.6)		(1.8)	(1.5)
Debt extinguishment loss				0	0
Other expense, net	0.2	(0.1)		1.0	6.3
Income (loss) before income taxes	(7.5)	(0.1)		(45.8)	13.6
Provision (benefit) for income taxes	0.9	3.0		5.4	7.7
Equity in earnings (losses) of subsidiaries	0	0		0	0
Net income (loss)	$ (8.4)	$ (3.1)		$ (51.2)	$ 5.9