Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of AOCI (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
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)