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Segment Information (Sales And Operating Profit By Segment And Reconciliation Of Segment Operating Profit To Earnings Before Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017
Net sales: |  |  |  |
Net sales | $ 689,049 | $ 632,403 | $ 1,316,584 | $ 1,222,073
Operating profit (loss): |  |  |  |
Operating profit (loss) | 44,271 | 64,827 | 110,574 | 117,189
Deductions from operating profit: |  |  |  |
Interest expense | 9,089 | 8,649 | 17,735 | 17,135
Equity-based compensation expense | 1,499 | 986 | 3,500 | 3,154
Corporate expenses and other, net | 8,014 | 6,989 | 15,836 | 12,209
Earnings before income taxes | 25,669 | 48,203 | 73,503 | 84,691
Aircraft Controls |  |  |  |
Net sales: |  |  |  |
Net sales | 311,439 | 289,661 | 589,973 | 558,111
Operating profit (loss): |  |  |  |
Operating profit (loss) | 33,480 | 31,181 | 64,248 | 54,292
Space And Defense Controls |  |  |  |
Net sales: |  |  |  |
Net sales | 143,527 | 138,834 | 276,920 | 261,424
Operating profit (loss): |  |  |  |
Operating profit (loss) | 16,841 | 11,381 | 33,130 | 20,469
Industrial Systems |  |  |  |
Net sales: |  |  |  |
Net sales | 234,083 | 203,908 | 449,691 | 402,538
Operating profit (loss): |  |  |  |
Operating profit (loss) | $ (6,050) | $ 22,265 | $ 13,196 | $ 42,428

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