Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details)

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PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year $ 238,727 $ 211,036  
Acquisitions 0 27,162  
Service cost 7,446 6,764 $ 6,150
Interest cost 9,725 8,740 8,927
Actuarial (gain) loss 26,841 4,087  
Exchange gain (6) (1,206)  
Benefit payments (19,167) (17,856)  
Benefit obligation, end of year 263,566 238,727 211,036
Change in plan assets:      
Fair value, beginning of year 142,225 131,753  
Acquisitions 0 25,897  
Actual return 11,244 625  
Employer contributions 17,562 1,806  
Fair value, end of year 151,864 142,225 131,753
Funded status (111,701) (96,502)  
Unrecognized actuarial loss (gain) 92,310 77,368  
Unrecognized prior service cost (1,048) (1,231)  
Net amount recognized (20,439) (20,365)  
Amounts recognized in the consolidated balance sheet:      
Current liability (760) (749)  
Noncurrent benefit liability (110,941) (95,753)  
Accumulated other comprehensive loss (income) 91,262 76,137  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 92,310 77,368  
Prior service cost (1,048) (1,231)  
Distributions to terminated employees 9,300 10,000  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 20,424 21,358  
Acquisitions 0 0  
Service cost 402 454 436
Interest cost 845 885 919
Actuarial (gain) loss 2,931 (814)  
Exchange gain 0 0  
Benefit payments (1,312) (1,459)  
Benefit obligation, end of year 23,290 20,424 21,358
Change in plan assets:      
Fair value, beginning of year 0 0  
Acquisitions 0 0  
Actual return 0 0  
Employer contributions 1,312 1,459  
Fair value, end of year 0 0 $ 0
Funded status (23,291) (20,424)  
Unrecognized actuarial loss (gain) 1,130 (1,801)  
Unrecognized prior service cost (916) (1,111)  
Net amount recognized (23,077) (23,336)  
Amounts recognized in the consolidated balance sheet:      
Current liability (1,148) (1,009)  
Noncurrent benefit liability (22,143) (19,415)  
Accumulated other comprehensive loss (income) 214 (2,912)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial loss (income) 1,130 (1,801)  
Prior service cost $ (916) $ (1,111)