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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill by Segment (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 28, 2019
Jun. 27, 2020
Dec. 28, 2019
Goodwill      
Gross balance, beginning     $ 478,111,000
Accumulated impairment losses     (49,247,000)
Balance, ending   $ 417,668,000 428,864,000
Carrying amount of goodwill      
Balance at the beginning of the period   428,864,000  
Acquisitions   6,227,000  
Asset impairment $ 0 (12,575,000)  
Foreign currency translation   (4,848,000)  
Balance at the end of the period   417,668,000  
Engineered Support Structures Segment      
Goodwill      
Gross balance, beginning     228,634,000
Accumulated impairment losses     (18,670,000)
Balance, ending   193,088,000 209,964,000
Carrying amount of goodwill      
Balance at the beginning of the period   209,964,000  
Acquisitions   0  
Asset impairment   (12,575,000)  
Foreign currency translation   (4,301,000)  
Balance at the end of the period   193,088,000  
Utility Support Structures Segment      
Goodwill      
Gross balance, beginning     130,594,000
Accumulated impairment losses     (14,355,000)
Balance, ending   117,480,000 116,239,000
Carrying amount of goodwill      
Balance at the beginning of the period   116,239,000  
Acquisitions   1,100,000  
Asset impairment   0  
Foreign currency translation   141,000  
Balance at the end of the period   117,480,000  
Coatings Segment      
Goodwill      
Gross balance, beginning     93,747,000
Accumulated impairment losses     (16,222,000)
Balance, ending   76,735,000 77,525,000
Carrying amount of goodwill      
Balance at the beginning of the period   77,525,000  
Acquisitions   0  
Asset impairment   0  
Foreign currency translation   (790,000)  
Balance at the end of the period   76,735,000  
Irrigation Segment      
Goodwill      
Gross balance, beginning     25,136,000
Accumulated impairment losses     0
Balance, ending   30,365,000 $ 25,136,000
Carrying amount of goodwill      
Balance at the beginning of the period   25,136,000  
Acquisitions   5,127,000  
Asset impairment   0  
Foreign currency translation   102,000  
Balance at the end of the period   $ 30,365,000