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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Mar. 29, 2019
Mar. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net income $ 21,923 $ 21,620 $ 25,444 $ 21,855
Foreign currency translation:        
Foreign currency translation (148) 505 (1,848) 229
Reclassification adjustment for currency translation gains related to the liquidation of foreign entities included in net income 0 (2,351) 0 (2,351)
Defined benefit pension plan:        
Unrecognized gain arising during period, net of tax of $22, $31, $44 and $62, respectively 71 99 141 197
Amortization of unrecognized losses included in net periodic benefit cost, net of tax of $11, $13, $22 and $26, respectively 34 39 69 80
Total other comprehensive loss (43) (1,708) (1,638) (1,845)
Total comprehensive income $ 21,880 $ 19,912 $ 23,806 $ 20,010