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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,263,089 | $ 892,574 | $ 739,046
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 1,263,089 | 892,574 | 739,046
Gross profit | 36,903 | 39,944 | 34,150 | 25,476 | 26,999 | 23,126 | 22,333 | 22,244 | 136,473 | 94,702 | 79,618
Operating income (loss) | 14,209 | 18,819 | 14,817 | 10,762 | 11,587 | 8,431 | 8,722 | 7,924 | 58,607 | 36,714 | 31,635
Segment assets | 568,932 |  |  |  | 409,978 |  |  |  | 568,932 | 409,978 | 323,135
Capital expenditures |  |  |  |  |  |  |  |  | 23,589 | 23,231 | 13,534
Depreciation and amortization |  |  |  |  |  |  |  |  | 18,518 | 12,782 | 11,485
Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 205,570 | 171,204 | 135,086
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 205,570 | 171,204 | 135,086
Gross profit |  |  |  |  |  |  |  |  | 20,629 | 21,754 | 16,676
Operating income (loss) |  |  |  |  |  |  |  |  | 7,703 | 11,185 | 7,609
Segment assets | 120,264 |  |  |  | 64,771 |  |  |  | 120,264 | 64,771 | 51,998
Capital expenditures |  |  |  |  |  |  |  |  | 9,055 | 2,129 | 2,581
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,292 | 2,167 | 1,823
Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 239,690 | 273,848 | 205,823
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 239,690 | 273,848 | 205,823
Gross profit |  |  |  |  |  |  |  |  | 26,912 | 32,879 | 20,070
Operating income (loss) |  |  |  |  |  |  |  |  | 9,939 | 15,415 | 8,134
Segment assets | 72,406 |  |  |  | 75,591 |  |  |  | 72,406 | 75,591 | 53,567
Capital expenditures |  |  |  |  |  |  |  |  | 5,421 | 2,942 | 2,346
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,768 | 2,943 | 2,838
Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 68,448 | 37,455 | 42,393
Operating income (loss) |  |  |  |  |  |  |  |  | 34,310 | 11,904 | 17,493
Segment assets | 200,493 |  |  |  | 159,149 |  |  |  | 200,493 | 159,149 | 150,543
Capital expenditures |  |  |  |  |  |  |  |  | 2,519 | 9,929 | 3,929
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,707 | 6,740 | 6,309
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 20,484 | 2,614 | 479
Operating income (loss) |  |  |  |  |  |  |  |  | 6,655 | (1,790) | (1,601)
Segment assets | 105,049 |  |  |  | 27,347 |  |  |  | 105,049 | 27,347 | 14,018
Capital expenditures |  |  |  |  |  |  |  |  | 1,157 | 1,645 | 741
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,751 | 932 | 515
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 70,720 |  |  |  | 83,120 |  |  |  | 70,720 | 83,120 | 53,009
Capital expenditures |  |  |  |  |  |  |  |  | 5,437 | 6,586 | 3,937
Gross [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,264,460 | 895,298 | 741,588
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 1,264,460 | 895,298 | 741,588
Gross [Member] | Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 205,570 | 171,204 | 135,086
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 205,570 | 171,204 | 135,086
Gross [Member] | Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 240,131 | 273,979 | 206,031
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 240,131 | 273,979 | 206,031
Gross [Member] | Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 611,826 | 395,794 | 380,488
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 611,826 | 395,794 | 380,488
Gross [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 206,933 | 54,321 | 19,983
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 206,933 | 54,321 | 19,983
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 206,933 | 54,321 | 19,983
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 206,933 | 54,321 | 19,983
Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 610,896 | 393,201 | 378,154
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 610,896 | 393,201 | 378,154
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,371 | 2,724 | 2,542
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 1,371 | 2,724 | 2,542
Intersegment Eliminations [Member] | Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 441 | 131 | 208
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 441 | 131 | 208
Intersegment Eliminations [Member] | Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 930 | 2,593 | 2,334
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 930 | 2,593 | 2,334
Intersegment Eliminations [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  | $ 0 | $ 0

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