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Purchased Intangible Assets (Narrative) (Details)
6 Months Ended
Mar. 31, 2013
Developed technology
 
Acquired Indefinite-lived Intangible Assets [Line Items]  
Weighted average useful life for intangibles (years) 5 years 29 days
Customer relationships
 
Acquired Indefinite-lived Intangible Assets [Line Items]  
Weighted average useful life for intangibles (years) 5 years 5 months 16 days
Other
 
Acquired Indefinite-lived Intangible Assets [Line Items]  
Weighted average useful life for intangibles (years) 2 years 5 months 16 days