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Segment Reporting (Details) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |
Net revenues | $ 278,635,000 | $ 141,850,000
Cost of revenues | 228,500,000 | 118,748,000
Gross profit | 50,135,000 | 23,102,000
Selling, general and administrative expenses | 14,350,000 | 11,186,000
Income (loss) from operations | 35,785,000 | 11,916,000
Other (expense) income, net | (43,000) | 48,000
Income (loss) from continuing operations before income taxes | 35,742,000 | 11,964,000
Income tax expense | 13,640,000 | 4,556,000
Income from continuing operations | 22,102,000 | 7,408,000
Amortization of purchased intangible assets | 243,000 | 334,000
Depreciation | 522,000 | 455,000
Fixed asset additions | 7,263,000 | 1,738,000
Goodwill | 18,476,000 | 18,476,000
Total assets | 234,724,000 | 205,252,000
Power Industry Services [Member] |  |
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |
Net revenues | 261,327,000 | 132,519,000
Cost of revenues | 214,817,000 | 111,193,000
Gross profit | 46,510,000 | 21,326,000
Selling, general and administrative expenses | 7,950,000 | 6,235,000
Income (loss) from operations | 38,560,000 | 15,091,000
Other (expense) income, net | (45,000) | 33,000
Income (loss) from continuing operations before income taxes | 38,515,000 | 15,124,000
Amortization of purchased intangible assets | 243,000 | 334,000
Depreciation | 290,000 | 207,000
Fixed asset additions | 6,986,000 | 1,598,000
Goodwill | 18,476,000 | 18,476,000
Total assets | 186,284,000 | 164,049,000
Telecommunications Infrastructure Services [Member] |  |
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |
Net revenues | 17,308,000 | 9,331,000
Cost of revenues | 13,683,000 | 7,555,000
Gross profit | 3,625,000 | 1,776,000
Selling, general and administrative expenses | 1,628,000 | 1,586,000
Income (loss) from operations | 1,997,000 | 190,000
Income (loss) from continuing operations before income taxes | 1,997,000 | 190,000
Depreciation | 229,000 | 244,000
Fixed asset additions | 277,000 | 136,000
Total assets | 4,032,000 | 3,121,000
Other [Member] |  |
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |
Selling, general and administrative expenses | 4,772,000 | 3,365,000
Income (loss) from operations | (4,772,000) | (3,365,000)
Other (expense) income, net | 2,000 | 15,000
Income (loss) from continuing operations before income taxes | (4,770,000) | (3,350,000)
Depreciation | 3,000 | 4,000
Fixed asset additions | 0 | 4,000
Total assets | $ 44,408,000 | $ 38,082,000

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