Goodwill and Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 30, 2013		Sep. 30, 2012
Goodwill (not amortized), Net Book Value	$ 748,251		$ 610,347
Intangible assets with finite lives (amortized), Gross Carrying Amount	555,852	[1]	441,590	[1]
Intangible assets with finite lives (amortized), Accumulated Amortization	277,104	[1]	255,705	[1]
Intangible assets with finite lives (amortized), Net Book Value	278,748	[1]	185,885	[1]
Total goodwill and acquired intangible asset	1,026,999		796,232
Purchased Software
Intangible assets with finite lives (amortized), Gross Carrying Amount	226,334		177,166
Intangible assets with finite lives (amortized), Accumulated Amortization	135,934		127,250
Intangible assets with finite lives (amortized), Net Book Value	90,400	[1]	49,916	[1]
Acquired finite-lived intangible asset, weighted average useful life	8 years
Capitalized Software
Intangible assets with finite lives (amortized), Gross Carrying Amount	22,877		22,877
Intangible assets with finite lives (amortized), Accumulated Amortization	22,877		22,877
Intangible assets with finite lives (amortized), Net Book Value	0	[1]	0	[1]
Customer Lists and Relationships
Intangible assets with finite lives (amortized), Gross Carrying Amount	289,952		227,097
Intangible assets with finite lives (amortized), Accumulated Amortization	105,473		93,215
Intangible assets with finite lives (amortized), Net Book Value	184,479	[1]	133,882	[1]
Acquired finite-lived intangible asset, weighted average useful life	10 years
Trademarks and Trade Names
Intangible assets with finite lives (amortized), Gross Carrying Amount	13,257		11,013
Intangible assets with finite lives (amortized), Accumulated Amortization	9,408		8,967
Intangible assets with finite lives (amortized), Net Book Value	3,849	[1]	2,046	[1]
Acquired finite-lived intangible asset, weighted average useful life	7 years
Other
Intangible assets with finite lives (amortized), Gross Carrying Amount	3,432		3,437
Intangible assets with finite lives (amortized), Accumulated Amortization	3,412		3,396
Intangible assets with finite lives (amortized), Net Book Value	$ 20	[1]	$ 41	[1]
Acquired finite-lived intangible asset, weighted average useful life	3 years

[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, 7 years, and 3 years, respectively.