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Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Mar. 31, 2017
Apr. 01, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense $ 7,878 $ 5,348 $ 3,777 $ 5,363
Net income 13,959 9,321 18,015 8,787
Unamortized Loss On Defined Benefit Pension Plans [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of Sales / Operating Expense 141 156 283 311
Income tax expense (54) (59) (108) (118)
Net income $ 87 $ 97 $ 175 $ 193