Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Intangible Assets (Detail)

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Goodwill and Other Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]    
Net Book Value $ 2,000 $ 2,000
Definite-lived:    
Accumulated Amortization (2,551) (1,459)
Net Book Value 1,434  
Total intangible assets, gross 5,985 5,194
Total intangible assets, net $ 3,434 3,735
Customer relationship    
Definite-lived:    
Useful Life 8 years  
Gross $ 1,645 1,100
Accumulated Amortization (229) (52)
Net Book Value $ 1,416 1,048
Acquired construction backlog    
Definite-lived:    
Useful Life 17 months  
Gross $ 820 594
Accumulated Amortization (820) (157)
Net Book Value $ 0 437
Non-compete agreements    
Definite-lived:    
Useful Life 5 years  
Gross $ 1,520 1,500
Accumulated Amortization (1,502) (1,250)
Net Book Value $ 18 $ 250
Minimum | Acquired construction backlog    
Definite-lived:    
Useful Life 7 months  
Maximum | Acquired construction backlog    
Definite-lived:    
Useful Life 17 months