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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | $ 741,588 | $ 628,514 | $ 553,286
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 2,542 | 1,462 | 2,472
Revenues | 184,862 | 183,899 | 200,964 | 169,321 | 163,629 | 136,333 | 175,252 | 151,838 | 739,046 | 627,052 | 550,814
Gross profit | 18,656 | 19,771 | 23,098 | 18,093 | 20,874 | 18,570 | 19,768 | 15,702 | 79,618 | 74,914 | 52,922
Operating income (loss) | 6,410 | 7,415 | 11,200 | 6,610 | 9,515 | 7,640 | 8,632 | 5,113 | 31,635 | 30,900 | 7,753
Segment assets | 323,135 |  |  |  | 306,436 |  |  |  | 323,135 | 306,436 | 284,808
Capital expenditures |  |  |  |  |  |  |  |  | 13,534 | 10,416 | 5,302
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,485 | 11,067 | 11,751
Electrical Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 135,086 | 151,065 | 103,015
Less: Inter-segment revenues |  |  |  |  |  |  |  |  |  | 7 | 21
Revenues |  |  |  |  |  |  |  |  | 135,086 | 151,058 | 102,994
Gross profit |  |  |  |  |  |  |  |  | 16,676 | 18,337 | 13,289
Operating income (loss) |  |  |  |  |  |  |  |  | 7,609 | 9,111 | 3,501
Segment assets | 51,998 |  |  |  | 46,411 |  |  |  | 51,998 | 46,411 | 47,456
Capital expenditures |  |  |  |  |  |  |  |  | 2,581 | 2,511 | 266
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,823 | 1,613 | 1,299
Oil Gas & Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 206,031 | 143,753 | 150,344
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 208 | 399 | 1,460
Revenues |  |  |  |  |  |  |  |  | 205,384 | 143,354 | 148,884
Gross profit |  |  |  |  |  |  |  |  | 20,070 | 13,647 | 9,121
Operating income (loss) |  |  |  |  |  |  |  |  | 8,134 | 3,105 | (849)
Segment assets | 53,567 |  |  |  | 42,801 |  |  |  | 53,567 | 42,801 | 43,603
Capital expenditures |  |  |  |  |  |  |  |  | 2,346 | 908 | 335
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,838 | 2,490 | 2,869
Storage Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 380,488 | 299,762 | 272,305
Less: Inter-segment revenues |  |  |  |  |  |  |  |  | 2,334 | 1,056 | 991
Revenues |  |  |  |  |  |  |  |  | 378,154 | 298,706 | 271,314
Gross profit |  |  |  |  |  |  |  |  | 42,393 | 38,779 | 27,806
Operating income (loss) |  |  |  |  |  |  |  |  | 17,493 | 16,612 | 6,183
Segment assets | 150,543 |  |  |  | 131,050 |  |  |  | 150,543 | 131,050 | 121,919
Capital expenditures |  |  |  |  |  |  |  |  | 3,929 | 4,098 | 1,440
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,309 | 6,533 | 7,220
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | 19,983 | 33,934 | 27,622
Revenues |  |  |  |  |  |  |  |  | 19,983 | 33,934 | 27,622
Gross profit |  |  |  |  |  |  |  |  | 479 | 4,151 | 2,706
Operating income (loss) |  |  |  |  |  |  |  |  | (1,601) | 2,072 | (1,082)
Segment assets | 14,018 |  |  |  | 19,542 |  |  |  | 14,018 | 19,542 | 11,341
Capital expenditures |  |  |  |  |  |  |  |  | 741 | 9 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 515 | 431 | 363
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 53,009 |  |  |  | 66,632 |  |  |  | 53,009 | 66,632 | 60,489
Capital expenditures |  |  |  |  |  |  |  |  | $ 3,937 | $ 2,890 | $ 3,231

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