Goodwill And Acquired Intangible Assets (Goodwill And Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified						12 Months Ended								12 Months Ended				12 Months Ended				12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2009	Sep. 30, 2011 Purchased Software [Member] years		Sep. 30, 2010 Purchased Software [Member]		Sep. 30, 2011 Capitalized Software [Member]		Sep. 30, 2010 Capitalized Software [Member]		Sep. 30, 2011 Customer Lists [Member] years		Sep. 30, 2010 Customer Lists [Member]		Sep. 30, 2011 Trademarks [Member] years		Sep. 30, 2010 Trademarks [Member]		Sep. 30, 2011 Other [Member] years		Sep. 30, 2010 Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill (not amortized), Net Book Value	$ 613,394		$ 418,509		$ 428,268
Intangible assets with finite lives (amortized), Gross Carrying Amount	443,767	[1]	317,817	[1]		178,388	[1]	134,375	[1]	22,877	[1]	22,877	[1]	227,961	[1]	148,753	[1]	11,035	[1]	8,274	[1]	3,506	[1]	3,538	[1]
Intangible assets with finite lives (amortized), Accumulated Amortization	221,750	[1]	189,886	[1]		112,555	[1]	98,193	[1]	22,877	[1]	22,877	[1]	75,050	[1]	60,490	[1]	7,967	[1]	5,196	[1]	3,301	[1]	3,130	[1]
Intangible assets with finite lives (amortized), Net Book Value	222,017	[1]	127,931	[1]		65,833	[1]	36,182	[1]		[1]		[1]	152,911	[1]	88,263	[1]	3,068	[1]	3,078	[1]	205	[1]	408	[1]
Total goodwill and acquired intangible assets	$ 835,411		$ 546,440
Weighted average useful lives (in years)						8								10				6				4

[1] The weighted average useful lives of purchased software, customer lists and relationships, trademarks and trade names and other intangible assets with a remaining net book value are 8 years, 10 years, 6 years and 4 years, respectively.