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BUSINESS COMBINATIONS - fair value of assets and liabilities acquired (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2016 | Dec. 04, 2015 | May. 29, 2015 | Jan. 31, 2015 | Jan. 31, 2014
Business Combinations |  |  |  |  |
Goodwill | $ 37,405,000 |  |  | $ 18,476,000 | $ 18,476,000
Goodwill expected to be deductible for tax purposes | $ 12,300,000 |  |  |  |
Acquired finite-lived intangible assets weighted-average amortization period | 6 years 10 months 24 days |  |  |  |
APC |  |  |  |  |
Business Combinations |  |  |  |  |
Cash |  |  | $ 2,274,000 |  |
Accounts receivable |  |  | 5,735,000 |  |
Costs and estimated earnings in excess of billings |  |  | 3,177,000 |  |
Prepaid expenses and other assets |  |  | 594,000 |  |
Property, plant and equipment |  |  | 1,303,000 |  |
Intangible assets |  |  | 543,000 |  |
Goodwill | $ 4,049,000 |  | 4,049,000 |  |
Less - Accounts payable and accrued expenses |  |  | 5,830,000 |  |
Less - Deferred income tax and other liabilities |  |  | 744,000 |  |
Net assets acquired |  |  | $ 11,101,000 |  |
Roberts |  |  |  |  |
Business Combinations |  |  |  |  |
Cash |  | $ 2,968,000 |  |  |
Accounts receivable |  | 18,931,000 |  |  |
Costs and estimated earnings in excess of billings |  | 2,162,000 |  |  |
Deferred income tax assets |  | 4,399,000 |  |  |
Prepaid expenses and other assets |  | 1,600,000 |  |  |
Property, plant and equipment |  | 7,127,000 |  |  |
Intangible assets |  | 7,487,000 |  |  |
Goodwill | $ 14,880,000 | 14,880,000 |  |  |
Less - Accounts payable and accrued expenses |  | 34,188,000 |  |  |
Less - Billings in excess of costs and estimated earnings |  | 9,229,000 |  |  |
Net assets acquired |  | $ 16,137,000 |  |  |

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