Acquisition (Unaudited Pro Forma Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 29, 2014		Mar. 30, 2013		Mar. 29, 2014		Mar. 30, 2013
Pro Forma
Revenue			$ 314,600		$ 635,900
Operating income			22,000				41,158
Net income			17,700		26,000
Earnings per share—Basic (in USD per share)			$ 0.15		$ 0.22
Earnings per share—Diluted (in USD per share)			$ 0.15		$ 0.21
As Reported
Revenue	328,700		313,949		653,625		633,700
Operating income	51,213	[1]	21,244	[1]	106,084	[1]	35,103	[1]
Net income	$ 43,756		$ 17,037		$ 83,413		$ 52,848
Earnings per share—Basic (in USD per share)	$ 0.37		$ 0.14		$ 0.70		$ 0.44
Earnings per share—Diluted (in USD per share)	$ 0.36		$ 0.14		$ 0.69		$ 0.44

[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.