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CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE (Details) - customer		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Accounts Receivable
Major Customers
Number of major power industry service customers	4			4
Major Customer One | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer				22.00%		18.00%
Major Customer Two | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer				22.00%		17.00%
Major Customer Three | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer				17.00%		17.00%
Major Customer Four | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer				15.00%		11.00%
Power Services | Revenue
Major Customers
Percentage of major customers or segments		92.00%	88.00%	92.00%	86.00%
Number of major power industry service customers		4	5	4	5
Power Services | Major Customer One | Revenue
Major Customers
Percentage of major customers or segments		31.00%	17.00%	28.00%	17.00%
Power Services | Major Customer Two | Revenue
Major Customers
Percentage of major customers or segments		27.00%	17.00%	26.00%	16.00%
Power Services | Major Customer Three | Revenue
Major Customers
Percentage of major customers or segments		17.00%	16.00%	19.00%	14.00%
Power Services | Major Customer Four | Revenue
Major Customers
Percentage of major customers or segments		13.00%	14.00%	15.00%	13.00%
Power Services | Major Customer Five | Revenue
Major Customers
Percentage of major customers or segments			13.00%		13.00%

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Number of major customers.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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