Goodwill And Intangible Assets (Components Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2012 Y	Oct. 01, 2011
Customer-Related [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	10
Gross Carrying Amount	$ 166,934	$ 159,861
Accumulated Amortization	(72,790)	(64,420)
Program-Related [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	18
Gross Carrying Amount	66,611	64,887
Accumulated Amortization	(11,592)	(9,163)
Technology-Related [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	9
Gross Carrying Amount	64,213	61,276
Accumulated Amortization	(32,205)	(28,876)
Marketing-Related [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	9
Gross Carrying Amount	24,402	23,669
Accumulated Amortization	(14,994)	(13,828)
Contract-Related [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	3
Gross Carrying Amount	3,328	3,238
Accumulated Amortization	(2,770)	(2,156)
Artistic-Related [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	10
Gross Carrying Amount	25	25
Accumulated Amortization	(25)	(25)
Acquired Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (years)	11
Gross Carrying Amount	325,513	312,956
Accumulated Amortization	$ (134,376)	$ (118,468)