Segment Information (Revenue And Operating Income) (Details) (USD $)	3 Months Ended		12 Months Ended												3 Months Ended	12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2012 Software Products Segment [Member]		Sep. 30, 2011 Software Products Segment [Member]		Sep. 30, 2010 Software Products Segment [Member]		Jan. 01, 2011 Services Segment [Member]	Sep. 30, 2012 Services Segment [Member]		Sep. 30, 2011 Services Segment [Member]		Sep. 30, 2010 Services Segment [Member]		Sep. 30, 2012 Selling and Marketing Expense [Member]	Sep. 30, 2012 General and Administrative Expense [Member]
Revenue			$ 1,255,679,000		$ 1,166,949,000		$ 1,010,049,000		$ 935,472,000		$ 875,511,000		$ 770,808,000			$ 320,207,000		$ 291,438,000		$ 239,241,000
Operating income			128,096,000	[1]	117,114,000	[1]	74,775,000	[1]	598,344,000	[1]	557,879,000	[1]	465,968,000	[1]		41,793,000	[1],[2]	22,577,000	[1],[2]	19,214,000	[1],[2]
Sales and marketing expenses			(392,956,000)	[1]	(353,051,000)	[1]	(317,532,000)	[1]
General and administrative expenses			(119,085,000)	[1]	(110,291,000)	[1]	(92,875,000)	[1]
Other income (expense)			(7,360,000)		(12,566,000)		7,361,000
Income before income taxes			120,736,000		104,548,000		82,136,000
Restructuring charges	4,100,000	20,800,000	24,928,000		0		0		4,100,000							4,000,000						15,200,000	1,600,000
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%

[1] We recorded restructuring charges of $24.9 million in 2012. Software Products included $4.1 million; Services included $4.0 million; sales and marketing expenses included $15.2 million; and general and administrative expenses included $1.6 million of the total restructuring and in-process research and development charges recorded in 2012.

[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%.