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Segments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Sales | $ 765,207 | $ 740,969 | $ 718,811 | $ 679,676 | $ 700,866 | $ 692,018 | $ 689,049 | $ 627,535 | $ 2,904,663 | $ 2,709,468 | $ 2,497,524
Aircraft Controls |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 1,302,972 | $ 1,193,505 | $ 1,124,885
Aircraft Controls | Aftermarket Sales | Net Sales, Segment |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Percentage of sales |  |  |  |  |  |  |  |  | 27.00% | 29.00% | 27.00%
Boeing |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 370,306 | $ 382,184 | $ 321,110
Boeing | Customer Concentration Risk | Net Sales |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Percentage of sales |  |  |  |  |  |  |  |  | 13.00% | 14.00% | 13.00%
Boeing Commercial Airplanes |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 264,805 | $ 238,118 | $ 252,977
Government Prime and Sub-Contract |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Product Lines |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 1,017,905 | $ 897,882 | $ 775,271

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