Amount after accumulated impairment loss of an asset representing 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
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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.

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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)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Percentage of fair value of reporting unit in excess of carrying amount.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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SEGMENT INFORMATION (Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Goodwill, Gross		$ 230,590
Goodwill, Impaired, Accumulated Impairment Loss		(58,845)
Goodwill [Roll Forward]
Goodwill, beginning balance		198,598	$ 239,256
Foreign currency translation adjustment		(11,484)	(5,840)
Goodwill, ending balance	$ 198,598	171,745	198,598	$ 239,256
Impairment of goodwill	(34,800)	(15,369)	(34,818)	0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount						122.00%
Tech & Clearance [Member]
Segment Reporting Information [Line Items]
Goodwill, Gross		94,038
Goodwill, Impaired, Accumulated Impairment Loss		0
Goodwill [Roll Forward]
Goodwill, beginning balance		95,523	95,946
Foreign currency translation adjustment		(1,485)	(423)
Goodwill, ending balance	95,523	94,038	95,523	95,946
Impairment of goodwill		0	0
Global Industry Group Segment [Member]
Segment Reporting Information [Line Items]
Goodwill, Gross		114,924
Goodwill, Impaired, Accumulated Impairment Loss		(57,400)
Goodwill [Roll Forward]
Goodwill, beginning balance		80,096	119,531
Foreign currency translation adjustment		(7,203)	(4,617)
Goodwill, ending balance	80,096	57,524	80,096	119,531
Impairment of goodwill		(15,369)	(34,818)
Healthcare Segment [Member]
Segment Reporting Information [Line Items]
Goodwill, Gross		7,714
Goodwill, Impaired, Accumulated Impairment Loss		(1,445)
Goodwill [Roll Forward]
Goodwill, beginning balance		6,269	6,269
Foreign currency translation adjustment		0	0
Goodwill, ending balance	6,269	6,269	6,269	6,269
Impairment of goodwill		0	0
Corporate & Other Segment [Member]
Segment Reporting Information [Line Items]
Goodwill, Gross		13,914
Goodwill, Impaired, Accumulated Impairment Loss		0
Goodwill [Roll Forward]
Goodwill, beginning balance		16,710	17,510
Foreign currency translation adjustment		(2,796)	(800)
Goodwill, ending balance	$ 16,710	13,914	16,710	$ 17,510
Impairment of goodwill		$ 0	$ 0
Finance Reporting Unit [Member]
Goodwill [Roll Forward]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		20.00%			27.00%	42.00%
Hospitality Reporting Unit [Member]
Goodwill [Roll Forward]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		16.00%			19.00%