Segment Information (Narrative) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2015 USD ($) segments product_area	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Segment Reporting Information [Line Items]
Restructuring charges	$ 43,409	$ 28,406	$ 52,197
Number of operating and reportable segments | segments	2
Number of product areas | product_area	4
Software Products [Member]
Segment Reporting Information [Line Items]
Restructuring charges	$ 11,600	2,800	17,700
Services [Member]
Segment Reporting Information [Line Items]
Restructuring charges	10,400	9,800	11,300
General And Administrative [Member]
Segment Reporting Information [Line Items]
Restructuring charges	5,100	1,800	5,100
Selling and Marketing Expense [Member]
Segment Reporting Information [Line Items]
Restructuring charges	$ 16,300	$ 13,900	$ 18,100