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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
June 30, 
 2017
 
September 30, 
 2016
Foreign currency translation adjustment
$
(5,295
)
 
$
(5,623
)
Retirement plan liability adjustment, net of tax
(6,531
)
 
(7,197
)
Interest rate swap agreement adjustment, net of tax
—

 
(30
)
Total accumulated other comprehensive loss
$
(11,826
)
 
$
(12,850
)