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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
December 31, 
 2016
 
September 30, 
 2016
Foreign currency translation adjustment
$
(6,671
)
 
$
(5,623
)
Retirement plan liability adjustment, net of tax
(6,963
)
 
(7,197
)
Interest rate swap agreement adjustment, net of tax
(14
)
 
(30
)
Total accumulated other comprehensive loss
$
(13,648
)
 
$
(12,850
)