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, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ 708,665 $ 730,820
Fair value of derivatives, tax 2,275 1,437
Pension liability, tax 35,426 27,530
Cumulative foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (122,259) (104,604)
Fair value of derivatives, net of tax of $2,275 and $1,437, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (3,559) (2,248)
Minimum pension liabilities, net of tax of $35,426 and $27,530, respectively    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (56,050) (43,474)
Accumulated Other Comprehensive (Loss) Income (net of tax)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ (181,868) $ (150,326)