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Segment Information - Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | $ 342,277 | $ 283,741 | $ 661,864 | $ 554,416 |
Revenues | 340,568 | 282,911 | 659,079 | 552,821 |
Gross profit | 27,886 | 26,703 | 51,307 | 55,594 |
Operating income | 5,527 | 5,174 | 7,747 | 12,495 |
Segment assets | 569,552 |  | 569,552 |  | $ 558,033
Electrical Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 58,173 | 64,852 | 102,874 | 144,823 |
Revenues | 58,173 | 64,852 | 102,874 | 144,823 |
Gross profit | 3,562 | 5,541 | 6,945 | 13,808 |
Operating income | 438 | 1,079 | 1,095 | 4,656 |
Segment assets | 147,246 |  | 147,246 |  | 161,207
Oil Gas & Chemical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 87,521 | 88,396 | 163,083 | 174,257 |
Revenues | 86,287 | 88,359 | 161,778 | 174,012 |
Gross profit | 9,157 | 11,768 | 14,782 | 22,806 |
Operating income | 3,585 | 5,198 | 4,099 | 9,332 |
Segment assets | 96,801 |  | 96,801 |  | 111,064
Storage Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 126,198 | 71,233 | 239,965 | 142,805 |
Revenues | 125,723 | 70,441 | 238,485 | 141,456 |
Gross profit | 11,147 | 5,298 | 20,700 | 12,838 |
Operating income | 1,356 | (2,609) | 1,641 | (2,684) |
Segment assets | 176,634 |  | 176,634 |  | 149,695
Industrial [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 70,385 | 59,260 | 155,942 | 92,531 |
Revenues | 70,385 | 59,259 | 155,942 | 92,530 |
Gross profit | 4,020 | 4,096 | 8,880 | 6,142 |
Operating income | 148 | 1,506 | 912 | 1,191 |
Segment assets | 61,250 |  | 61,250 |  | 58,816
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment assets | 87,621 |  | 87,621 |  | $ 77,251
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 1,709 | 830 | 2,785 | 1,595 |
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 1,234 | 37 | 1,305 | 245 |
Intersegment Eliminations [Member] | Storage Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 475 | 792 | 1,480 | 1,349 |
Intersegment Eliminations [Member] | Industrial [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | $ 0 | $ 1 | $ 0 | $ 1 |

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