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Accrued Insurance (Tables)
12 Months Ended
Sep. 30, 2018
Insurance [Abstract]  
Accrued insurance liability (in thousands)

      2018       2017  
Accrued insurance, current portion   $ 1,896       558  
Prepaid insurance claims     (1,235 )      (501 ) 
Accrued insurance, non-current     204       193  
Total accrued insurance   $ 865       250  
Captive agreement assets     3,644       4,506  
Gross accrued insurance   $ 4,509       4,756