Segment Information (Revenue and Operating Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 29, 2014		Mar. 30, 2013		Mar. 29, 2014 segments		Mar. 30, 2013
Number of operating and reportable segments					2
Revenue	$ 328,700		$ 313,949		$ 653,625		$ 633,700
Operating income	51,213	[1]	21,244	[1]	106,084	[1]	35,103	[1]
Sales and marketing expenses	85,933	[1]	92,965	[1]	(170,644)	[1]	(193,291)	[1]
General and administrative expenses	34,140	[1]	34,171	[1]	(65,419)	[1]	(70,827)	[1]
Other income (expense), net	(2,692)		(1,867)		(4,446)		(3,672)
Income before income taxes	48,521		19,377		101,638		31,431
Restructuring charges	0		15,810		1,067		31,212
Segment Software Products
Revenue	245,423		236,580		489,677		475,869
Operating income	154,859	[1]	141,536	[1]	313,099	[1]	285,127	[1]
Restructuring charges			6,100		100		11,600
Segment Services
Revenue	83,277		77,369		163,948		157,831
Operating income	16,427	[1]	6,844	[1]	29,048	[1]	14,094	[1]
Restructuring charges			4,000		200		6,300
Sales and Marketing
Restructuring charges			4,900		500		11,700
General and Administrative
Restructuring charges			800		300		1,600
Restructuring Plan 2013 Q3
Restructuring charges					1,100
Restructuring Plan 2013 Q2
Restructuring charges			$ 15,800				$ 31,200

[1] We recorded restructuring charges of $1.1 million in the first six months of 2014. Software Products included $0.1 million; Services included $0.2 million; sales and marketing expenses included $0.5 million; and general and administrative expenses included $0.3 million of these restructuring charges. We recorded restructuring charges of $15.8 million and $31.2 million in the second quarter and first six months of 2013, respectively. Software Products included $6.1 million and $11.6 million, respectively; Services included $4.0 million and $6.3 million, respectively; sales and marketing expenses included $4.9 million and $11.7 million, respectively; and general and administrative expenses included $0.8 million and $1.6 million, respectively, of these restructuring charges.