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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]    
Foreign currency translation adjustments, taxes $ 0 $ 0
Amortization of accumulated other comprehensive loss into net periodic benefit cost, taxes 0 0
Net actuarial gains arising during the period, taxes 0 0
Curtailment gain, taxes $ 0 $ 0