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Goodwill and Intangible Assets Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life   10 years 4 months 24 days  
Finite-Lived Intangible Assets, Gross   $ 59,017 $ 39,662
Finite-Lived Intangible Assets, Accumulated Amortization   (15,207) (13,039)
Intangible Assets, Net (Excluding Goodwill)   43,810 26,623
Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross   7,854 5,084
Finite-Lived Intangible Assets, Accumulated Amortization   (1,446) (1,267)
Intangible Assets, Net (Excluding Goodwill)   $ 6,408 3,817
Trademarks and Trade Names [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years 5 years  
Trademarks and Trade Names [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 20 years 20 years  
Technical Library      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 20 years 20 years  
Finite-Lived Intangible Assets, Gross   $ 400 400
Finite-Lived Intangible Assets, Accumulated Amortization   (131) (121)
Intangible Assets, Net (Excluding Goodwill)   269 279
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross   46,189 33,539
Finite-Lived Intangible Assets, Accumulated Amortization   (12,779) (11,051)
Intangible Assets, Net (Excluding Goodwill)   $ 33,410 22,488
Customer Relationships [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 6 years 6 years  
Customer Relationships [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years 15 years  
Noncompete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years 5 years  
Finite-Lived Intangible Assets, Gross   $ 1,300 40
Finite-Lived Intangible Assets, Accumulated Amortization   (34) (9)
Intangible Assets, Net (Excluding Goodwill)   $ 1,266 31
Backlog [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 1 year  
Finite-Lived Intangible Assets, Gross   $ 3,274 599
Finite-Lived Intangible Assets, Accumulated Amortization   (817) (591)
Intangible Assets, Net (Excluding Goodwill)   $ 2,457 $ 8
Construction Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 1 year