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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
March 31, 
 2020
 
September 30, 
 2019
Foreign currency translation adjustment
$
(5,604
)
 
$
(5,667
)
Retirement plan liability adjustment, net of tax
(7,205
)
 
(7,642
)
Total accumulated other comprehensive loss
$
(12,809
)
 
$
(13,309
)