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Quarterly Results of Operations (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2021
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 205,556 $ 191,659 $ 184,401 $ 207,597 $ 186,120 $ 182,585 $ 172,112 $ 180,779 $ 789,213 $ 721,596 $ 783,972
Gross profit 31,807 26,838 23,259 27,173 22,197 14,350 15,250 13,706 109,077 65,503 70,531
Loss from continuing operations (34,330) (3,875) (5,133) (3,964) (6,743) (13,714) (12,380) 19,757 (47,302) (13,080) (127,470)
Earnings from discontinued operations 107,391 3,964 6,140 7,325 1,140 1,965 3,325 5,892 124,820 12,322 18,265
Net earnings 73,061 89 1,007 3,361 (5,603) (11,749) (9,055) 25,649      
Earnings (loss) attributable to common shareholders $ 70,206 $ (2,755) $ (1,597) $ 1,336 $ (7,620) $ (13,758) $ (11,056) $ 23,654 $ 67,190 $ (8,780) $ (117,114)
Basic earnings (loss) per share:                      
From continuing operations $ (0.41) $ (0.07) $ (0.09) $ (0.07) $ (0.10) $ (0.18) $ (0.16) $ 0.20 $ (0.65) $ (0.24) $ (1.55)
From discontinued operations 1.19 0.04 0.07 0.08 0.01 0.02 0.04 0.07 1.40 0.14 0.21
Basic earnings (loss) per share 0.78 (0.03) (0.02) 0.02 (0.09) (0.16) (0.13) 0.27 0.75 (0.10) (1.34)
Diluted earnings (loss) per share:                      
From continuing operations (0.41) (0.07) (0.09) (0.07) (0.10) (0.18) (0.16) 0.20 (0.65) (0.24) (1.55)
From discontinued operations 1.19 0.04 0.07 0.08 0.01 0.02 0.04 0.06 1.40 0.14 0.21
Diluted earnings (loss) per share $ 0.78 $ (0.03) $ (0.02) $ 0.02 $ (0.09) $ (0.16) $ (0.13) $ 0.26 $ 0.75 $ (0.10) $ (1.34)