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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | $ 1,097,738 | $ 1,207,510 | $ 1,316,466
Less: Inter-segment revenues | $ 293,087 | $ 245,645 | $ 282,911 | $ 269,910 | $ 291,836 | $ 251,237 | $ 312,655 | $ 341,781 | 1,091,553 | 1,197,509 | 1,311,917
Revenues | 293,087 | 245,645 | 282,911 | 269,910 | 291,836 | 251,237 | 312,655 | 341,781 | 1,091,553 | 1,197,509 | 1,311,917
Gross profit | 21,451 | 14,891 | 26,703 | 28,891 | 23,127 | (2,614) | 28,212 | 32,278 | 91,936 | 81,003 | 125,991
Operating income (loss) | (17,112) | $ (5,862) | $ 5,174 | $ 7,321 | 3,531 | $ (21,210) | $ 8,237 | $ 14,301 | (10,479) | 4,859 | 40,882
Segment assets | 558,033 |  |  |  | 586,030 |  |  |  | 558,033 | 586,030 | 564,967
Capital expenditures |  |  |  |  |  |  |  |  | 8,711 | 11,908 | 13,939
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,347 | 21,602 | 21,441
Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 255,931 | 373,384 | 349,011
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 255,931 | 373,384 | 349,011
Revenues |  |  |  |  |  |  |  |  | 255,931 | 373,384 | 349,011
Gross profit |  |  |  |  |  |  |  |  | 18,300 | 7,137 | 29,301
Operating income (loss) |  |  |  |  |  |  |  |  | (16,531) | (8,309) | 11,144
Segment assets | 161,207 |  |  |  | 183,351 |  |  |  | 161,207 | 183,351 | 135,298
Capital expenditures |  |  |  |  |  |  |  |  | 493 | 1,390 | 1,611
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,359 | 5,198 | 5,008
Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 324,546 | 247,423 | 252,973
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 322,772 | 240,523 | 249,795
Revenues |  |  |  |  |  |  |  |  | 322,772 | 240,523 | 249,795
Gross profit |  |  |  |  |  |  |  |  | 33,423 | 12,675 | 18,553
Operating income (loss) |  |  |  |  |  |  |  |  | 8,798 | (8,783) | (3,503)
Segment assets | 111,064 |  |  |  | 129,177 |  |  |  | 111,064 | 129,177 | 91,350
Capital expenditures |  |  |  |  |  |  |  |  | 1,514 | 829 | 1,481
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,904 | 6,299 | 4,811
Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 319,106 | 483,254 | 564,738
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 314,696 | 481,696 | 563,512
Revenues |  |  |  |  |  |  |  |  | 314,696 | 481,696 | 563,512
Gross profit |  |  |  |  |  |  |  |  | 25,778 | 55,651 | 67,843
Operating income (loss) |  |  |  |  |  |  |  |  | (5,907) | 22,928 | 33,449
Segment assets | 149,695 |  |  |  | 166,742 |  |  |  | 149,695 | 166,742 | 201,875
Capital expenditures |  |  |  |  |  |  |  |  | 3,346 | 2,017 | 3,882
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,623 | 7,277 | 8,124
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 198,155 | 103,449 | 149,744
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 198,154 | 101,906 | 149,599
Revenues |  |  |  |  |  |  |  |  | 198,154 | 101,906 | 149,599
Gross profit |  |  |  |  |  |  |  |  | 14,435 | 5,540 | 10,294
Operating income (loss) |  |  |  |  |  |  |  |  | 3,161 | (977) | (208)
Segment assets | 58,816 |  |  |  | 53,754 |  |  |  | 58,816 | 53,754 | 67,569
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 38 | 104
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,461 | 2,828 | 3,498
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | $ 77,251 |  |  |  | $ 53,006 |  |  |  | 77,251 | 53,006 | 68,875
Capital expenditures |  |  |  |  |  |  |  |  | 3,358 | 7,634 | 6,861
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 6,185 | 10,001 | 4,549
Revenues |  |  |  |  |  |  |  |  | 6,185 | 10,001 | 4,549
Intersegment Eliminations [Member] | Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 1,774 | 6,900 | 3,178
Revenues |  |  |  |  |  |  |  |  | 1,774 | 6,900 | 3,178
Intersegment Eliminations [Member] | Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 4,410 | 1,558 | 1,226
Revenues |  |  |  |  |  |  |  |  | 4,410 | 1,558 | 1,226
Intersegment Eliminations [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 1 | 1,543 | 145
Revenues |  |  |  |  |  |  |  |  | $ 1 | $ 1,543 | $ 145

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