Goodwil and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2016
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 37,860	$ 35,871
Accumulated Amortization	6,820	4,148
INTANGIBLE ASSETS, NET	31,040	31,723
Trademarks And Trade Names [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	4,104	3,845
Accumulated Amortization	271	139
INTANGIBLE ASSETS, NET	$ 3,833	$ 3,706
Trademarks And Trade Names [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	20 years	20 years
Trademarks And Trade Names [Member] | Minimum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	5 years	5 years
Technical Library [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 400	$ 400
Accumulated Amortization	71	61
INTANGIBLE ASSETS, NET	$ 329	$ 339
Technical Library [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	20 years	20 years
Customer Relationships [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 28,614	$ 27,414
Accumulated Amortization	3,325	2,003
INTANGIBLE ASSETS, NET	$ 25,289	$ 25,411
Customer Relationships [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	15 years	15 years
Customer Relationships [Member] | Minimum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	6 years	6 years
Developed Technology [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 400	$ 400
Accumulated Amortization	400	358
INTANGIBLE ASSETS, NET	$ 0	$ 42
Developed Technology [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	4 years	4 years
Order Backlog [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 2,151	$ 1,621
Accumulated Amortization	1,133	545
INTANGIBLE ASSETS, NET	$ 1,018	$ 1,076
Order Backlog [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	1 year	1 year
Construction Contract Value [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 2,191	$ 2,191
Accumulated Amortization	1,620	1,042
INTANGIBLE ASSETS, NET	$ 571	$ 1,149
Construction Contract Value [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	1 year	1 year