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Segment Information (Financial Information By Geographic Area) (Details) $ in Thousands	3 Months Ended												12 Months Ended
	Oct. 02, 2015 USD ($)	Jun. 26, 2015 USD ($)	Mar. 27, 2015 USD ($)	Dec. 26, 2014 USD ($)	Sep. 26, 2014 USD ($)	Jun. 27, 2014 USD ($)	Mar. 28, 2014 USD ($)	Dec. 27, 2013 USD ($)	Sep. 27, 2013 USD ($)	Jun. 28, 2013 USD ($)	Mar. 29, 2013 USD ($)	Dec. 28, 2012 USD ($)	Oct. 02, 2015 USD ($) segments categories	Sep. 26, 2014 USD ($)	Sep. 27, 2013 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of service categories | categories													4
Number of reportable segments | segments													1
Revenues	$ 3,116,954	$ 2,907,541	$ 2,903,332	$ 3,187,005	$ 3,218,442	$ 3,231,791	$ 3,176,033	$ 3,068,891	$ 3,142,656	$ 3,080,995	$ 2,835,084	$ 2,759,641	$ 12,114,832	$ 12,695,157	$ 11,818,376
Long-lived assets	381,238				456,797				379,296				381,238	456,797	379,296
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													7,154,433	7,078,366	6,993,594
Long-lived assets	208,155				240,501				230,281				208,155	240,501	230,281
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													2,074,837	2,402,399	2,148,504
Long-lived assets	55,713				58,562				47,128				55,713	58,562	47,128
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													1,065,651	1,344,632	1,652,386
Long-lived assets	36,647				51,622				61,122				36,647	51,622	61,122
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													304,393	299,086	204,203
Long-lived assets	3,859				4,063				4,272				3,859	4,063	4,272
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													163,871	148,453	158,908
Long-lived assets	16,264				17,960				15,049				16,264	17,960	15,049
Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													611,271	709,379	141,507
Long-lived assets	24,460				49,436				8,329				24,460	49,436	8,329
South America and Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													143,014	271,213	241,590
Long-lived assets	9,127				11,084				6,159				9,127	11,084	6,159
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													597,362	441,629	277,684
Long-lived assets	$ 27,013				$ 23,569				$ 6,956				$ 27,013	$ 23,569	$ 6,956

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