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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
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 (losses) arising during the period, taxes $ 0 $ 0