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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
June 30, 
 2018
 
September 30, 
 2017
Foreign currency translation adjustment
$
(4,825
)
 
$
(4,607
)
Retirement plan liability adjustment, net of tax
(4,164
)
 
(4,648
)
Interest rate swap agreement adjustment, net of tax
24

 
4

Total accumulated other comprehensive loss
$
(8,965
)
 
$
(9,251
)