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ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | $ 636,548 | $ 610,807
Fair value of derivatives, tax | 504 | 1,908
Pension liability, tax | 11,638 | 26,988
Cumulative foreign currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | (155,251) | (151,881)
Derivatives |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | (1,558) | (5,884)
Minimum pension liabilities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | (35,930) | (82,954)
Accumulated Other Comprehensive (Loss) Income (net of tax) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | $ (192,739) | $ (240,719)

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