Segment Information (Financial Information by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,640,587	$ 2,693,873	$ 2,781,763	$ 2,847,934	$ 3,116,954	$ 2,907,541	$ 2,903,332	$ 3,187,005	$ 3,218,442	$ 3,231,791	$ 3,176,033	$ 3,068,891	$ 10,964,157	$ 12,114,832	$ 12,695,157
Long-Lived Assets	319,673				381,238				456,797				319,673	381,238	456,797
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													6,247,448	7,154,433	7,078,366
Long-Lived Assets	195,392				208,155				240,501				195,392	208,155	240,501
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													2,346,224	2,074,837	2,402,399
Long-Lived Assets	37,163				55,713				58,562				37,163	55,713	58,562
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													927,942	1,065,651	1,344,632
Long-Lived Assets	21,464				36,647				51,622				21,464	36,647	51,622
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													299,952	304,393	299,086
Long-Lived Assets	3,069				3,859				4,063				3,069	3,859	4,063
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													187,929	163,871	148,453
Long-Lived Assets	13,350				16,264				17,960				13,350	16,264	17,960
Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													436,670	611,271	709,379
Long-Lived Assets	18,888				24,460				49,436				18,888	24,460	49,436
South America and Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													125,610	143,014	271,213
Long-Lived Assets	5,621				9,127				11,084				5,621	9,127	11,084
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													392,382	597,362	441,629
Long-Lived Assets	$ 24,726				$ 27,013				$ 23,569				$ 24,726	$ 27,013	$ 23,569