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Reportable Segments Revenue By Sector (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2016 | Mar. 29, 2015 | Mar. 27, 2016 | Mar. 29, 2015
Revenue by client sector |  |  |  |
Threshold percentage for disclosure of revenue from a single client |  |  | 10.00% |
Revenue | $ 627,384 | $ 564,763 | $ 1,188,092 | $ 1,145,819
International |  |  |  |
Revenue by client sector |  |  |  |
Revenue | 206,902 | 173,680 | 342,708 | 320,741
U.S. commercial |  |  |  |
Revenue by client sector |  |  |  |
Revenue | 174,381 | 157,082 | 362,545 | 330,741
U.S. federal government |  |  |  |
Revenue by client sector |  |  |  |
Revenue | 178,015 | 169,324 | 343,037 | 355,034
U.S. state and local government |  |  |  |
Revenue by client sector |  |  |  |
Revenue | $ 68,086 | $ 64,677 | $ 139,802 | $ 139,303

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