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Enterprise-Wide Disclosures (Net Sales And Long-Lived Assets (Property, Plant, And Equipment) By Geographic Area) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Segment Reporting Information [Line Items]                      
Net sales $ 117,028 $ 108,352 $ 111,725 $ 109,217 $ 118,544 $ 113,601 $ 118,517 $ 117,135 $ 446,322 $ 467,797 $ 484,965
Long-lived assets 27,548       30,496       27,548 30,496 27,925
Domestic (U.S.)                      
Segment Reporting Information [Line Items]                      
Net sales                 329,230 361,886 347,552
Long-lived assets 7,454       8,988       7,454 8,988 11,406
Foreign                      
Segment Reporting Information [Line Items]                      
Net sales                 117,092 105,911 137,413
Mexico                      
Segment Reporting Information [Line Items]                      
Long-lived assets 19,395       20,878       19,395 20,878 15,756
China                      
Segment Reporting Information [Line Items]                      
Long-lived assets $ 699       $ 630       $ 699 $ 630 $ 763