Goodwill and Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 04, 2015		Sep. 30, 2014
Goodwill (not amortized), Net Book Value	$ 984,953		$ 1,012,527
Intangible assets with finite lives (amortized), Gross Carrying Amount	661,118	[1]	684,015	[1]
Intangible assets with finite lives (amortized), Accumulated Amortization	359,675	[1]	347,142	[1]
Intangible assets with finite lives (amortized), Net Book Value	301,443	[1]	336,873	[1]
Intangible Assets, Net (Including Goodwill)	1,286,396		1,349,400
Purchased Software
Intangible assets with finite lives (amortized), Gross Carrying Amount	269,825		278,012
Intangible assets with finite lives (amortized), Accumulated Amortization	164,236		162,259
Intangible assets with finite lives (amortized), Net Book Value	105,589	[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	346,506		360,530
Intangible assets with finite lives (amortized), Accumulated Amortization	157,454		147,469
Intangible assets with finite lives (amortized), Net Book Value	189,052	[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	18,010		18,479
Intangible assets with finite lives (amortized), Accumulated Amortization	11,597		10,964
Intangible assets with finite lives (amortized), Net Book Value	6,413	[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	3,900		4,117
Intangible assets with finite lives (amortized), Accumulated Amortization	3,511		3,573
Intangible assets with finite lives (amortized), Net Book Value	$ 389	[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.