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Segment Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Segment Reporting Information [Line Items]      
Revenue $ 211,884 $ 165,579  
Cost of revenue 197,702 157,766  
Gross profit 14,182 7,813  
Selling, general and administrative expenses 16,334 18,580  
Restructuring costs 3,348 0 $ 3,600
Operating loss $ (5,500) (10,767)  
Segment Information
Note 7 – Segment Information
We operate our business through a number of different operating subsidiaries, which are organized into three reportable segments based on the type of work performed and the markets serviced:
•Storage and Terminal Solutions: primarily consists of engineering, procurement, fabrication, and construction services related to cryogenic and other specialty tanks and terminals for LNG, NGLs such as butane, propane, ethane, ethylene, and other liquid petroleum products, as well as hydrogen and ammonia. We also perform work related to traditional aboveground crude oil and refined product storage tanks and terminals. This segment also includes terminal balance of plant work, truck and rail loading/offloading facilities, and marine structures as well as storage tank and terminal maintenance and repair. Finally, we manufacture and sell precision engineered specialty tank products, including geodesic domes, aluminum internal floating roofs, floating suction and skimmer systems, roof drain systems and floating roof seals.
•Utility and Power Infrastructure: primarily consists of engineering, procurement, fabrication, and construction services to support growing demand for LNG utility peak shaving facilities. We also perform power delivery work for public and private utilities, including construction of new substations, upgrades of existing substations, and maintenance. We also provide construction services to a variety of power generation facilities, including natural gas fired facilities in simple or combined cycle configurations for base load, peaking, and backup power supply.
•Process and Industrial Facilities: primarily consists of plant maintenance, repair, and turnarounds in the downstream and midstream markets for energy clients including refining and processing of crude oil, fractionating, and marketing of natural gas and natural gas liquids. We also perform engineering, procurement, fabrication, and construction for refinery upgrades and retrofits for renewable fuels, including hydrogen processing, production, loading and distribution facilities. We also engineer and construct thermal vacuum test chambers for aerospace and defense industries and other infrastructure for industries including chemicals, petrochemical, sulfur, mining and minerals, cement, agriculture, wastewater treatment facilities and other industrial customers.
Our Chief Operating Decision Maker ("CODM") is our President and Chief Executive Officer, who regularly reviews operating and financial performance based on our segments. The Company's CODM uses segment operating income as the key metric in evaluating segment performance. The CODM uses this metric in the budget and forecasting processes. The CODM considers budget-to-actual and forecast-to-actual variances when making decisions about allocating resources, including capital and personnel, to the segments.
We incur certain expenses at the corporate level that relate to our business as a whole. A portion of these expenses are allocated to our business segments. The balance of the corporate level expenses are reported in the Corporate "Selling, general and administrative expenses" line, which is primarily comprised of corporate facility expense, the cost of the executive management team, and other expenses pertaining to certain centralized functions that benefit the entire Company but are not directly attributable to any specific business segment, such as corporate human resources, legal, governance, compliance and finance functions. The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies (see Note 1). We eliminate intersegment sales; therefore, no intercompany profit or loss is recognized. Segment assets consist primarily of accounts receivable, costs and estimated earnings in excess of billings on uncompleted contracts, property, plant and equipment, right-of-use lease assets, goodwill and other intangible assets. Corporate assets consist primarily of cash, restricted cash, prepaid expenses, corporate fixed assets, and corporate operating lease right-of-use assets.
    
Segment, Expenditure, Addition to Long-Lived Assets $ 2,011 1,944  
Depreciation and amortization 2,461 2,515  
Segment assets $ 598,186   600,256
Number of Reportable Segments | segment 3    
Storage and Terminal Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 109,459 78,239  
Cost of revenue 102,962 73,542  
Gross profit 6,497 4,697  
Selling, general and administrative expenses 5,548 5,569  
Restructuring costs 1,759    
Operating loss (810) (872)  
Segment, Expenditure, Addition to Long-Lived Assets 871 1,047  
Depreciation and amortization 533 $ 522  
Segment assets $ 209,625   194,354
Storage and Terminal Solutions [Member] | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Segment Information (1) Total revenues are net of inter-segment revenues which are primarily Storage and Terminal Solutions and Process and Industrial Facilities and were $0.6 million for the three months ended September 30, 2025. (1) Total revenues are net of inter-segment revenues which are primarily Storage and Terminal Solutions and Process and Industrial Solutions and were $0.9 million for the three months ended September 30, 2024.  
Utility and Power Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 74,501 $ 55,912  
Cost of revenue 67,717 54,605  
Gross profit 6,784 1,307  
Selling, general and administrative expenses 2,977 3,976  
Restructuring costs 640    
Operating loss 3,167 (2,669)  
Segment, Expenditure, Addition to Long-Lived Assets 851 280  
Depreciation and amortization 92 92  
Segment assets 114,261   98,582
Process and Industrial Facilities [Member]      
Segment Reporting Information [Line Items]      
Revenue 27,924 31,428  
Cost of revenue 26,495 29,431  
Gross profit 1,429 1,997  
Selling, general and administrative expenses 1,307 1,766  
Restructuring costs 729    
Operating loss (607) 231  
Segment, Expenditure, Addition to Long-Lived Assets 81 139  
Depreciation and amortization 217 168  
Segment assets 32,156   39,490
Corporate Segment      
Segment Reporting Information [Line Items]      
Revenue 0 0  
Cost of revenue 528 188  
Gross profit (528) (188)  
Selling, general and administrative expenses 6,502 7,269  
Restructuring costs 220    
Operating loss (7,250) (7,457)  
Segment, Expenditure, Addition to Long-Lived Assets 208 478  
Depreciation and amortization 1,619 $ 1,733  
Segment assets $ 242,144   $ 267,830