Stock-Based Compensation (Schedule Of Classification Of Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011
Total stock-based compensation expense	$ 12,692	$ 9,871	$ 26,074	$ 20,898
Cost Of License Revenue [Member]
Total stock-based compensation expense	7	3	12	6
Cost Of Service Revenue [Member]
Total stock-based compensation expense	2,171	1,583	4,684	3,720
Sales And Marketing [Member]
Total stock-based compensation expense	3,306	2,350	7,034	4,779
Research And Development [Member]
Total stock-based compensation expense	2,240	1,749	4,789	4,142
General And Administrative [Member]
Total stock-based compensation expense	$ 4,968	$ 4,186	$ 9,555	$ 8,251