Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands  | 
Sep. 30, 2019  | 
Sep. 30, 2018  | 
|---|---|---|
| Cost | $ 41,730 | $ 41,730 | 
| Accumulated Amortization | 17,849 | 12,263 | 
| Net Book Value | 23,881 | 29,467 | 
| Customer Relationships [Member] | ||
| Cost | 29,070 | 29,070 | 
| Accumulated Amortization | 10,321 | 7,459 | 
| Net Book Value | 18,749 | 21,611 | 
| Trade Names [Member] | ||
| Cost | 8,329 | 8,329 | 
| Accumulated Amortization | 3,958 | 2,537 | 
| Net Book Value | 4,371 | 5,792 | 
| Non-compete Agreements [Member] | ||
| Cost | 4,331 | 4,331 | 
| Accumulated Amortization | 3,570 | 2,267 | 
| Net Book Value | $ 761 | $ 2,064 | 
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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