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Segments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 649,268 | $ 626,183 | $ 632,403 | $ 589,670 | $ 619,078 | $ 613,260 | $ 611,142 | $ 568,457 | $ 2,497,524 | $ 2,411,937 | $ 2,525,532
Percentage of aftermarket sale in both military and commercial production segment |  |  |  |  |  |  |  |  | 27.00% | 29.00% | 30.00%
Boeing |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 321,110 | $ 346,596 | $ 399,082
Percentage of sales to Boeing |  |  |  |  |  |  |  |  | 13.00% | 14.00% | 16.00%
Boeing Commercial Airplanes |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 252,977 | $ 251,288 | $ 240,984
Government Prime and Sub-Contract |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 775,271 | $ 726,562 | $ 780,259

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