Goodwill and Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012	Sep. 30, 2012
Software Products Segment [Member]
Goodwill and acquired intangible assets	$ 1,000.0	$ 768.1
Services Segment [Member]
Goodwill and acquired intangible assets	$ 43.5	$ 28.1