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DIVESTITURE - Summary of Gain (Loss) on Divestiture (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net loss from divestiture of the grinding media business   $ (6,084) $ 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 loss from divestiture of the grinding media business $ (6,084)