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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