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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  |  |  | $ 895,298 | $ 741,588 | $ 628,514
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  |  |  | 2,724 | 2,542 | 1,462
Revenues | 235,560 | [1] | 225,970 | 221,436 | [2] | 209,608 | 184,862 | [1] | 183,899 | 200,964 | 169,321 | 892,574 | 739,046 | 627,052
Gross profit | 26,999 | [1] | 23,126 | 22,333 | [2] | 22,244 | 18,656 | [1] | 19,771 | 23,098 | 18,093 | 94,702 | 79,618 | 74,914
Operating income (loss) | 11,587 | [1] | 8,431 | 8,772 | [2] | 7,924 | 6,410 | [1] | 7,415 | 11,200 | 6,610 | 36,714 | 31,635 | 30,900
Segment assets | 409,978 |  |  |  |  |  | 323,135 |  |  |  |  | 409,978 | 323,135 | 306,436
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 23,231 | 13,534 | 10,416
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 12,782 | 11,485 | 11,067
Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  |  |  | 171,204 | 135,086 | 151,065
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 7
Revenues |  |  |  |  |  |  |  |  |  |  |  | 171,204 | 135,086 | 151,058
Gross profit |  |  |  |  |  |  |  |  |  |  |  | 21,754 | 16,676 | 18,337
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 11,185 | 7,609 | 9,111
Segment assets | 64,771 |  |  |  |  |  | 51,998 |  |  |  |  | 64,771 | 51,998 | 46,411
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 2,129 | 2,581 | 2,511
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 2,167 | 1,823 | 1,613
Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  |  |  | 273,979 | 206,031 | 143,753
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  |  |  | 131 | 208 | 399
Revenues |  |  |  |  |  |  |  |  |  |  |  | 273,848 | 205,823 | 143,354
Gross profit |  |  |  |  |  |  |  |  |  |  |  | 32,879 | 20,070 | 13,647
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 15,415 | 8,134 | 3,105
Segment assets | 75,591 |  |  |  |  |  | 53,567 |  |  |  |  | 75,591 | 53,567 | 42,801
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 2,942 | 2,346 | 908
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 2,943 | 2,838 | 2,490
Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  |  |  | 395,794 | 380,488 | 299,762
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  |  |  | 2,593 | 2,334 | 1,056
Revenues |  |  |  |  |  |  |  |  |  |  |  | 393,201 | 378,154 | 298,706
Gross profit |  |  |  |  |  |  |  |  |  |  |  | 37,455 | 42,393 | 38,779
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 11,904 | 17,493 | 16,612
Segment assets | 159,149 |  |  |  |  |  | 150,543 |  |  |  |  | 159,149 | 150,543 | 131,050
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 9,929 | 3,929 | 4,098
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 6,740 | 6,309 | 6,533
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  |  |  | 54,321 | 19,983 | 33,934
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Revenues |  |  |  |  |  |  |  |  |  |  |  | 54,321 | 19,983 | 33,934
Gross profit |  |  |  |  |  |  |  |  |  |  |  | 2,614 | 479 | 4,151
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | (1,790) | (1,601) | 2,072
Segment assets | 27,347 |  |  |  |  |  | 14,018 |  |  |  |  | 27,347 | 14,018 | 19,542
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 1,645 | 741 | 9
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 932 | 515 | 431
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment assets | 83,120 |  |  |  |  |  | 53,009 |  |  |  |  | 83,120 | 53,009 | 66,632
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 6,586 | $ 3,937 | $ 2,890
[1] | The fourth quarter of fiscal 2013 includes a pretax charge on a Canadian project of $0.6 million. The fourth quarter of fiscal 2012 included an income tax charge of $3.1 million. The income tax charge represents adjustments of $2.1 million for prior fiscal years and $1.0 million in fiscal 2012, of which $0.2 million related to fourth quarter activity.
[2] | The second quarter of fiscal 2013 includes a pretax charge on a Canadian project of $3.3 million

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