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Basis of Presentation - Fair Value (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Jun. 30, 2015
Property and equipment
Net value of turnkey security screening program assets at Mexico	$ 15,000
Business Combinations
Goodwill	122,297	$ 98,167
Series of Individually Immaterial Business Acquisitions
Business Combinations
Cash payments at closing	17,500
Goodwill	20,400
Intangible assets acquired	7,800
Series of Individually Immaterial Business Acquisitions | Indemnity holdbacks
Business Combinations
Contingent consideration	2,600
Series of Individually Immaterial Business Acquisitions | Fair value
Business Combinations
Contingent consideration	12,500
Recurring
Fair value of financial instruments
Equity securities	317	2,441
Insurance company contracts	20,651	20,100
Interest rate contract	(22)	(41)
Total assets	20,946	22,500
Liabilities - Contingent payment obligations	21,832	17,175
Recurring | Level 1
Fair value of financial instruments
Equity securities	317	291
Total assets	317	291
Recurring | Level 2
Fair value of financial instruments
Equity securities		2,150
Insurance company contracts	20,651	20,100
Interest rate contract	(22)	(41)
Total assets	20,629	22,209
Recurring | Level 3
Fair value of financial instruments
Total assets	0	0
Liabilities - Contingent payment obligations	21,832	$ 17,175
Technology | Series of Individually Immaterial Business Acquisitions
Business Combinations
Intangible assets acquired	1,200
Customer relationships | Series of Individually Immaterial Business Acquisitions
Business Combinations
Intangible assets acquired	5,500
Trademarks and trade names | Series of Individually Immaterial Business Acquisitions
Business Combinations
Intangible assets acquired	900
Non-compete covenants | Series of Individually Immaterial Business Acquisitions
Business Combinations
Intangible assets acquired	$ 200

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