Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Fair Value Allocation of Plan Assets (Details)

v3.5.0.2
PENSION AND OTHER POSTRETIREMENT PLANS - Fair Value Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 151,864 $ 142,225
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 127,306 111,714
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 11,742 16,529
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 12,816 13,982
Equity securities - stocks    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35,912 31,559
Equity securities - stocks | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35,912 31,559
Equity securities - stocks | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Equity securities - stocks | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Equity securities - mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 22,937 28,901
Equity securities - mutual funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 22,937 27,846
Equity securities - mutual funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 1,055
Equity securities - mutual funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 52,831 55,118
Fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 41,099 39,644
Fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 11,732 15,474
Fixed income securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 19,664 4,494
Cash and cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 19,664 4,494
Cash and cash equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Cash and cash equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 20,520 22,153
Other investments | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7,694 8,171
Other investments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 10 0
Other investments | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 12,816 $ 13,982