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Basis of Presentation - Fair Value (Details) $ in Thousands	6 Months Ended	9 Months Ended
	Dec. 31, 2016 USD ($) item	Mar. 31, 2017 USD ($) item	Jun. 30, 2016 USD ($)
Fair Value of Financial Instruments
Liabilities - Contingent payment obligations		$ 14,347	$ 17,117
Property and Equipment
Net value of turnkey security screening program assets not in use at Mexico		$ 15,000
Goodwill Impairment
Total number of reporting units | item		3
Number of reporting units that are not tested with two-step goodwill impairment | item	2
Goodwill impairment without two-step impairment test	$ 0
Percentage of decrease hypothetically applied to the fair value	10.00%
Goodwill impairment after two-step goodwill impairment test	$ 0
Recurring
Fair Value of Financial Instruments
Equity securities		$ 266	354
Insurance company contracts		25,614	21,353
Interest rate contract		22	(31)
Total assets		25,902	21,676
Liabilities - Contingent payment obligations		14,347	17,117
Recurring | Level 1
Fair Value of Financial Instruments
Equity securities		266	354
Total assets		266	354
Recurring | Level 2
Fair Value of Financial Instruments
Insurance company contracts		25,614	21,353
Interest rate contract		22	(31)
Total assets		25,636	21,322
Recurring | Level 3
Fair Value of Financial Instruments
Total assets		0
Liabilities - Contingent payment obligations		$ 14,347	$ 17,117

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