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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