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DEFINED BENEFIT PENSION EXPENSE
 9 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
DEFINED BENEFIT PENSION EXPENSE
DEFINED BENEFIT PENSION EXPENSE

Defined benefit pension expense (income) was as follows:
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Interest cost
$
1,402

 
$
1,065

 
$
4,206

 
$
5,225

Expected return on plan assets
(2,735
)
 
(2,489
)
 
(8,207
)
 
(8,321
)
Amortization:
 

 
 

 
 

 
 

Prior service cost
4

 
3

 
12

 
11

Recognized actuarial loss
832

 
590

 
2,496

 
1,771

Net periodic expense (income)
$
(497
)
 
$
(831
)
 
$
(1,493
)
 
$
(1,314
)


In 2016, the Company changed the method used to estimate the service and interest components of net periodic benefit cost for pension and other post-retirement benefits from the single weighted-average discount rate to the spot rate method.  There was no impact on the total benefit obligation.