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DIVESTITURE - Summary of Gain (Loss) on Divestiture (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net pre-tax loss from divestiture of the grinding media business   $ 0 $ (6,084) $ 0
Donhad | Disposed by sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-tax gain from divestiture, before recognition of currency translation loss $ 4,334      
Recognition of cumulative currency translation loss and hedges (out of OCI) (10,418)      
Net pre-tax loss from divestiture of the grinding media business $ (6,084)