Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012 segments	Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011
Segment Reporting Information [Line Items]
Charges to operations	$ 20,802	$ 0	$ 20,802	$ 0
Revenue, Net	301,125	269,189	619,401	535,741
Number of operating and reportable segments	2
Software Products Segment [Member]
Segment Reporting Information [Line Items]
Charges to operations	9,200
Revenue, Net	221,653	203,156	458,616	405,066
Services Segment [Member]
Segment Reporting Information [Line Items]
Charges to operations	2,700
Revenue, Net	79,472	66,033	160,785	130,675
Selling and Marketing Expense [Member]
Segment Reporting Information [Line Items]
Charges to operations	7,300
General and Administrative Expense [Member]
Segment Reporting Information [Line Items]
Charges to operations	1,600
Germany [Member]
Segment Reporting Information [Line Items]
Revenue, Net	41,200	38,500	97,400	71,800
United States [Member]
Segment Reporting Information [Line Items]
Revenue, Net	$ 102,300	$ 89,900	$ 213,000	$ 185,300