Segment Information (Revenue And Operating Income) (Details) (USD $)	3 Months Ended	12 Months Ended
	Jan. 01, 2011	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2009
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue		$ 1,166,949,000		$ 1,010,049,000		$ 938,185,000
Operating income		117,114,000	[1]	74,775,000	[1]	19,295,000	[1]
Sales and marketing expenses		(353,051,000)	[1]	(317,532,000)	[1]	(312,847,000)	[1]
General and administrative expenses		(110,291,000)	[1]	(92,875,000)	[1]	(84,694,000)	[1]
Restructuring and other charges and in-process research and development charges						23,000,000
Software Products Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue		875,511,000		770,808,000		691,825,000
Operating income		557,879,000	[1]	465,968,000	[1]	397,156,000	[1]
Restructuring and other charges and in-process research and development charges						4,100,000
Services Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue		291,438,000		239,241,000		246,360,000
Operating income		22,577,000	[1],[2]	19,214,000	[1],[2]	19,680,000	[1],[2]
Restructuring and other charges and in-process research and development charges						3,400,000
Expected cost exceeding revenue in automotive contract	5,000,000
Estimated loss on automotive contract	5,000,000
Reduction of service margin percentage	2.00%
Sales And Marketing [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Restructuring and other charges and in-process research and development charges						11,500,000
General And Administrative [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Restructuring and other charges and in-process research and development charges						$ 4,000,000

[1] We recorded restructuring and in-process research and development charges of $23.0 million in 2009. Software Products included $4.1 million; Services included $3.4 million; sales and marketing expenses included $11.5 million; and general and administrative expenses included $4.0 million, of the total restructuring and in-process research and development charges recorded in 2009.

[2] In the first quarter of 2011, we made a strategic decision to enter into a contract with a customer in the automotive industry, for which we expect our costs to exceed our revenue by approximately $5 million. Services segment operating income in 2011 includes immediate recognition of the approximately $5 million estimated loss on this contract and resulted in a reduction of service margins by approximately 2%.