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, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ 868,351 $ 789,707
Fair value of derivatives, tax 2,771 1,544
Pension liability, tax 12,076 27,114
Cumulative foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (134,960) (112,907)
Fair value of derivatives, net of tax of $2,771 and $1,544, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income 8,538 2,415
Minimum pension liabilities, net of tax of $12,076 and $27,114, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (37,876) (43,623)
Accumulated Other Comprehensive (Loss) Income (net of tax)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ (164,298) $ (154,115)