Quarterly report pursuant to Section 13 or 15(d)

PENSION PLANS - Discount Rates (Details)

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PENSION PLANS - Discount Rates (Details)
Jun. 30, 2018
Apr. 30, 2018
U.S. qualified defined benefit pension plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate used to calculate benefit obligation 4.25%  
Supplemental defined benefit pension plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate used to calculate benefit obligation 4.24% 4.22%