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Legal, Environmental and Other Contingencies - Schedule of Maturities (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Feb. 11, 2016
item
Environmental post-closure monitoring and maintenance activities $ 606 $ 504  
Maturities of long-term obligations (discounted)      
Number of leaks reported in entity's chemical cleaning operations | item     1
Long Term Obligations      
Maturities of long-term obligations (discounted)      
2021 74    
2022 64    
2023 81    
2024 60    
2025 and thereafter 229    
Long-term obligations (less current portion) 508    
Pending litigation      
Environmental post-closure monitoring and maintenance activities $ 606