OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign currency translation adjustments	$ (5,736)	$ (1,289)
Pension and other defined benefit plans	271	14,244
Cash flow hedges	157	130
Total other comprehensive income (loss)	(5,308)	13,085
Other Comprehensive Income (Loss), Tax [Abstract]
Pension and other defined benefit plans	(87)	(4,685)
Cash flow hedges	(55)	(42)
Total other comprehensive income (loss)	(142)	(4,727)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(5,736)	(1,289)
Pension and other defined benefit plans	184	9,559
Cash flow hedges	102	88
Total other comprehensive income (loss), net of taxes	$ (5,450)	$ 8,358

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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