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, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ 610,807 $ 718,106
Fair value of derivatives, tax 1,908 131
Pension liability, tax 26,988 23,195
Cumulative foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (151,881) (156,214)
Fair value of derivatives, net of tax of $1,908 and $131, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (5,884) (404)
Minimum pension liabilities, net of tax of $26,988 and $23,195, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (82,954) (71,743)
Accumulated Other Comprehensive (Loss) Income (net of tax)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ (240,719) $ (228,361)