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Segment Information (Segment Sales by Customer) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Segment Reporting Information |  |
Net sales | $ 679,676 | $ 627,535
Commercial Customer |  |
Segment Reporting Information |  |
Net sales | 397,865 | 386,687
U.S. Government Customer |  |
Segment Reporting Information |  |
Net sales | 238,088 | 198,143
Other Customer |  |
Segment Reporting Information |  |
Net sales | 43,723 | 42,705
Aircraft Controls |  |
Segment Reporting Information |  |
Net sales | 304,045 | 278,534
Aircraft Controls | Commercial Customer |  |
Segment Reporting Information |  |
Net sales | 157,244 | 154,334
Aircraft Controls | U.S. Government Customer |  |
Segment Reporting Information |  |
Net sales | 117,181 | 95,997
Aircraft Controls | Other Customer |  |
Segment Reporting Information |  |
Net sales | 29,620 | 28,203
Space And Defense Controls |  |
Segment Reporting Information |  |
Net sales | 156,068 | 133,393
Space And Defense Controls | Commercial Customer |  |
Segment Reporting Information |  |
Net sales | 30,053 | 29,647
Space And Defense Controls | U.S. Government Customer |  |
Segment Reporting Information |  |
Net sales | 114,465 | 90,752
Space And Defense Controls | Other Customer |  |
Segment Reporting Information |  |
Net sales | 11,550 | 12,994
Industrial Systems |  |
Segment Reporting Information |  |
Net sales | 219,563 | 215,608
Industrial Systems | Commercial Customer |  |
Segment Reporting Information |  |
Net sales | 210,568 | 202,706
Industrial Systems | U.S. Government Customer |  |
Segment Reporting Information |  |
Net sales | 6,442 | 11,394
Industrial Systems | Other Customer |  |
Segment Reporting Information |  |
Net sales | $ 2,553 | $ 1,508

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