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Segment Information - Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |
Gross revenues | $ 319,587 | $ 270,675 |
Revenues | 318,511 | 269,910 |
Gross profit | 23,421 | 28,891 |
Operating income | 2,220 | 7,321 |
Segment assets | 587,194 |  | $ 558,033
Electrical Infrastructure [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | 44,701 | 79,971 |
Revenues | 44,701 | 79,971 |
Gross profit | 3,383 | 8,267 |
Operating income | 657 | 3,577 |
Segment assets | 159,595 |  | 161,207
Oil Gas & Chemical [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | 75,562 | 85,861 |
Revenues | 75,491 | 85,653 |
Gross profit | 5,625 | 11,038 |
Operating income | 514 | 4,134 |
Segment assets | 109,417 |  | 111,064
Storage Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | 113,767 | 71,572 |
Revenues | 112,762 | 71,015 |
Gross profit | 9,553 | 7,540 |
Operating income | 285 | (75) |
Segment assets | 163,125 |  | 149,695
Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | 85,557 | 33,271 |
Revenues | 85,557 | 33,271 |
Gross profit | 4,860 | 2,046 |
Operating income | 764 | (315) |
Segment assets | 61,080 |  | 58,816
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment assets | 93,977 |  | $ 77,251
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | 1,076 | 765 |
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | 71 | 208 |
Intersegment Eliminations [Member] | Storage Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross revenues | $ 1,005 | $ 557 |

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