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Revenue Recognition - Summary of Impact of Topic 606 on Consolidated Statement of Comprehensive Income (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 27, 2018
Sep. 27, 2018
Dec. 28, 2017
Sep. 28, 2017
Dec. 27, 2018
Dec. 28, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net sales $ 253,317   $ 258,805   $ 457,605 $ 474,469
Gross profit 42,883   37,733   75,837 72,852
Income from operations 16,640   14,102   26,692 31,717
Net income $ 11,264 $ 6,606 $ 7,609 $ 10,711 $ 17,870 $ 18,320
Earnings per share-basic $ 0.99   $ 0.67   $ 1.57 $ 1.61
Earnings per share-diluted $ 0.98   $ 0.67   $ 1.56 $ 1.60
Disaggregation of Revenue Before 606 Impact [Member] | Accounting Standards Update 2014-09 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net sales     $ 259,118     $ 473,909
Gross profit     37,880     72,720
Income from operations     14,249     31,585
Net income     $ 7,756     $ 18,188
Earnings per share-basic     $ 0.68     $ 1.60
Earnings per share-diluted     $ 0.68     $ 1.59
Impact of 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net sales     $ (313)     $ 560
Gross profit     (147)     132
Income from operations     (147)     132
Net income     $ (147)     $ 132
Earnings per share-basic     $ (0.01)     $ 0.01
Earnings per share-diluted     $ (0.01)     $ 0.01