Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

GOODWILL (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
GOODWILL (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Oct. 31, 2016	Oct. 31, 2015	Jan. 31, 2016
Finite-Lived Intangible Assets
Goodwill		$ 34,913	$ 22,525	$ 37,405
Percentage of contract backlog suspended	90.00%
Impairment loss		1,979
APC
Finite-Lived Intangible Assets
Impairment loss		2,000	$ 0
GPS
Finite-Lived Intangible Assets
Goodwill		18,500
TRC
Finite-Lived Intangible Assets
Goodwill		14,400
APC
Finite-Lived Intangible Assets
Goodwill		$ 2,000