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Segment Information - Revenue and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jan. 01, 2016 | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: | $ 4,142,644 | $ 4,156,663 | $ 3,935,028 | $ 2,750,311 | $ 2,653,866 | $ 2,514,751 | $ 2,302,567 | $ 2,551,604 | $ 2,640,587 | $ 2,693,873 | $ 2,781,763 | $ 2,847,934 | $ 14,984,646 | $ 10,022,788 | $ 10,964,157
Property, equipment and improvements, net: | 457,706 |  |  |  | 349,911 |  |  |  | 319,673 |  |  |  | 457,706 | 349,911 | 319,673
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 9,519,085 | 5,822,843 | 6,247,448
Property, equipment and improvements, net: | 316,633 |  |  |  | 220,416 |  |  |  | 195,392 |  |  |  | 316,633 | 220,416 | 195,392
Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 2,768,739 | 2,262,092 | 2,346,224
Property, equipment and improvements, net: | 59,019 |  |  |  | 46,108 |  |  |  | 37,163 |  |  |  | 59,019 | 46,108 | 37,163
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 863,531 | 590,604 | 927,942
Property, equipment and improvements, net: | 21,559 |  |  |  | 18,435 |  |  |  | 21,464 |  |  |  | 21,559 | 18,435 | 21,464
Asia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 316,339 | 253,167 | 299,952
Property, equipment and improvements, net: | 3,588 |  |  |  | 2,793 |  |  |  | 3,069 |  |  |  | 3,588 | 2,793 | 3,069
India |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 211,983 | 165,295 | 187,929
Property, equipment and improvements, net: | 19,446 |  |  |  | 19,191 |  |  |  | 13,350 |  |  |  | 19,446 | 19,191 | 13,350
Australia and New Zealand |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 719,566 | 628,945 | 436,670
Property, equipment and improvements, net: | 16,151 |  |  |  | 18,692 |  |  |  | 18,888 |  |  |  | 16,151 | 18,692 | 18,888
South America and Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 159,700 | 73,456 | 125,610
Property, equipment and improvements, net: | 4,562 |  |  |  | 4,619 |  |  |  | 5,621 |  |  |  | 4,562 | 4,619 | 5,621
Middle East and Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  | 425,703 | 226,386 | 392,382
Property, equipment and improvements, net: | $ 16,748 |  |  |  | $ 19,657 |  |  |  | $ 24,726 |  |  |  | $ 16,748 | $ 19,657 | $ 24,726

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