Annual report pursuant to Section 13 and 15(d)

Segment Information (Consolidated Net Sales And Long Lived Assets) (Details)

v3.10.0.1
Segment Information (Consolidated Net Sales And Long Lived Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 299,023 $ 296,767 $ 301,460 $ 291,998 $ 273,114 $ 261,765 $ 257,063 $ 255,323 $ 1,189,248 $ 1,047,265 $ 1,006,083
Long-lived assets 158,780       176,251       158,780 176,251  
China [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 586,518 482,965 437,386
Long-lived assets 89,509       96,248       89,509 96,248  
United States [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 116,299 121,056 $ 130,427
Long-lived assets $ 49,195       $ 59,589       $ 49,195 $ 59,589