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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 135,483	$ 115,813	$ 369,907	$ 341,105
Oil and gas (excludes petrochemical)
Disaggregation of Revenue [Line Items]
Revenues	58,669	49,272	155,324	139,443
Petrochemical
Disaggregation of Revenue [Line Items]
Revenues	15,187	15,365	51,268	34,725
Electric utility
Disaggregation of Revenue [Line Items]
Revenues	30,173	26,175	82,079	82,797
Traction power
Disaggregation of Revenue [Line Items]
Revenues	9,775	13,821	31,200	42,322
All others
Disaggregation of Revenue [Line Items]
Revenues	21,679	11,180	50,036	41,818
United States
Disaggregation of Revenue [Line Items]
Revenues	102,931	88,412	272,069	256,937
Canada
Disaggregation of Revenue [Line Items]
Revenues	23,599	16,529	60,777	48,354
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	6,697	8,926	30,078	28,120
Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenues	1,645	1,651	4,235	6,376
Mexico, Central and South America
Disaggregation of Revenue [Line Items]
Revenues	$ 611	$ 295	$ 2,748	$ 1,318

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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