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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Comprehensive Income (Loss) (Details) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 USD ($)
Components of accumulated other comprehensive income (loss) |
Beginning balance | $ 1,151,795
Current-period comprehensive income (loss) | (34,581)
Divestiture of grinding media business | 10,418
Ending balance | 1,135,523
Foreign Currency Translation Adjustments |
Components of accumulated other comprehensive income (loss) |
Beginning balance | (171,399)
Current-period comprehensive income (loss) | (68,065)
Divestiture of grinding media business | 9,203
Ending balance | (230,261)
Gain on Hedging Activities |
Components of accumulated other comprehensive income (loss) |
Beginning balance | 6,357
Current-period comprehensive income (loss) | 3,599
Divestiture of grinding media business | 1,215
Ending balance | 11,171
Defined Benefit Pension Plan |
Components of accumulated other comprehensive income (loss) |
Beginning balance | (113,980)
Current-period comprehensive income (loss) | 29,885
Divestiture of grinding media business | 0
Ending balance | (84,095)
Accumulated Other Comprehensive Income (Loss) |
Components of accumulated other comprehensive income (loss) |
Beginning balance | (279,022)
Ending balance | $ (303,185)

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