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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Mar. 31, 2017
Apr. 01, 2016
Condensed Consolidated Statements Of Comprehensive Income (Loss) [Abstract]        
Change in pension plan, tax $ 54 $ 59 $ 108 $ 118