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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Supplemental Disclosures of Cash Flow Information
Supplemental Disclosures of Cash Flow Information (in thousands): 
 
Year Ended September 30,
 
2018
 
2017
 
2016
Cash paid (received) during the period for:
 
 
 
 
 
Interest paid, net of interest income
$
(676
)
 
$
(384
)
 
4

Income taxes paid, net of refunds
354

 
(764
)
 
(352
)
Non-cash capital expenditures
129

 
634

 
221