Goodwill and Intangible Assets (Amortization of Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 6,640,000	$ 5,132,000	$ 13,263,000	$ 10,341,000
Cost of license revenue	4,628,000	3,931,000	9,267,000	8,034,000
Total amortization expense	11,268,000	9,063,000	22,530,000	18,375,000
Estimated aggregate future amortization expense for intangible assets, remainder of 2013	22,200,000		22,200,000
Estimated aggregate future amortization expense for intangible assets, 2014	45,900,000		45,900,000
Estimated aggregate future amortization expense for intangible assets, 2015	44,200,000		44,200,000
Estimated aggregate future amortization expense for intangible assets, 2016	37,600,000		37,600,000
Estimated aggregate future amortization expense for intangible assets, 2017	33,900,000		33,900,000
Estimated aggregate future amortization expense for intangible assets, 2018	30,100,000		30,100,000
Estimated aggregate future amortization expense for intangible assets, thereafter	$ 64,900,000		$ 64,900,000