Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions	9 Months Ended
	Jul. 02, 2011	Jul. 02, 2011 Software Products Segment [Member]	Sep. 30, 2010 Software Products Segment [Member]	Jul. 02, 2011 Services Segment [Member]	Sep. 30, 2010 Services Segment [Member]
Goodwill and acquired intangible assets		$ 821.4	$ 524.3	$ 30.5	$ 22.1
Estimated aggregate future amortization expense for intangible assets, Current Year	10.2
Estimated aggregate future amortization expense for intangible assets, Year One	36.3
Estimated aggregate future amortization expense for intangible assets, Year Two	36.0
Estimated aggregate future amortization expense for intangible assets, Year Three	33.7
Estimated aggregate future amortization expense for intangible assets, Year Four	30.1
Estimated aggregate future amortization expense for intangible assets, Year Five	22.0
Estimated aggregate future amortization expense for intangible assets, After Year Five	$ 59.9