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, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ 718,106 $ 868,351
Fair value of derivatives, tax 131 2,771
Pension liability, tax 23,195 12,076
Cumulative foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (156,214) (134,960)
Fair value of derivatives, net of tax of $131 and $2,771, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (404) 8,538
Minimum pension liabilities, net of tax of $23,195 and $12,076, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (71,743) (37,876)
Accumulated Other Comprehensive (Loss) Income (net of tax)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ (228,361) $ (164,298)