Goodwill and Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jan. 03, 2015		Sep. 30, 2014
Goodwill (not amortized), Net Book Value	$ 1,000,992		$ 1,012,527
Intangible assets with finite lives (amortized), Gross Carrying Amount	674,051	[1]	684,015	[1]
Intangible assets with finite lives (amortized), Accumulated Amortization	355,030	[1]	347,142	[1]
Intangible assets with finite lives (amortized), Net Book Value	319,021	[1]	336,873	[1]
Total goodwill and acquired intangible asset, Net Book Value	1,320,013		1,349,400
Purchased Software
Intangible assets with finite lives (amortized), Gross Carrying Amount	274,592		278,012
Intangible assets with finite lives (amortized), Accumulated Amortization	164,060		162,259
Intangible assets with finite lives (amortized), Net Book Value	110,532	[1]	115,753	[1]
Acquired finite-lived intangible asset, weighted average useful life	9 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	354,319		360,530
Intangible assets with finite lives (amortized), Accumulated Amortization	153,248		147,469
Intangible assets with finite lives (amortized), Net Book Value	201,071	[1]	213,061	[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	18,229		18,479
Intangible assets with finite lives (amortized), Accumulated Amortization	11,278		10,964
Intangible assets with finite lives (amortized), Net Book Value	6,951	[1]	7,515	[1]
Acquired finite-lived intangible asset, weighted average useful life	9 years
Other
Intangible assets with finite lives (amortized), Gross Carrying Amount	4,034		4,117
Intangible assets with finite lives (amortized), Accumulated Amortization	3,567		3,573
Intangible assets with finite lives (amortized), Net Book Value	$ 467	[1]	$ 544	[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 9 years, 10 years, 9 years, and 3 years, respectively.