Purchased Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended					3 Months Ended	12 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2013 Developed technology	Sep. 30, 2013 Customer relationships	Sep. 30, 2013 Other	Sep. 30, 2012 Chingis	Sep. 14, 2012 Chingis	Sep. 30, 2012 Si En	Sep. 30, 2011 Si En	Jan. 31, 2011 Si En	Sep. 30, 2012 Cost of sales Si En	Sep. 30, 2012 Operating expenses Si En
Acquired Indefinite-lived Intangible Assets [Line Items]
Additions to purchased intangible assets								$ 7,900,000			$ 11,600,000
Impairment of intangible assets	0	8,887,000	145,000							8,900,000			5,400,000	3,500,000
Weighted average useful life for intangibles (years)					4 years 10 months 8 days	4 years 11 months 15 days	1 year 11 months 15 days
In process research and development transferred to developed technology	400,000
Goodwill	9,178,000	9,178,000	9,463,000	1,301,000					3,976,000	3,900,000		8,162,000
Impairment	$ 0	$ 4,261,000	$ 0							$ 4,300,000