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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Summary of Defined Benefit Plans Included in Other Income

Defined benefit pension expense (income) included in Other Income (Expense), net was as follows:
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Interest cost
$
1,148

 
$
1,570

 
$
3,450

 
$
4,711

Expected return on plan assets
(2,585
)
 
(2,583
)
 
(7,757
)
 
(7,749
)
Amortization:
 

 
 

 
 

 
 

Prior service cost
3

 
4

 
11

 
11

Recognized actuarial loss
1,042

 
222

 
3,126

 
666

Net periodic expense (income)
$
(392
)
 
$
(787
)
 
$
(1,170
)
 
$
(2,361
)