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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) customer segment	Dec. 31, 2018 USD ($) customer	Jun. 30, 2019 USD ($)
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment			3
Total revenues	$ 305,342	$ 303,205	$ 596,194	$ 569,454
Income (Loss) from Operations	32,919	31,707	57,806	$ 47,964
Segments assets	1,301,926		$ 1,301,926		$ 1,264,864
Revenue | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer			0	0
Accounts receivable | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer			1
Concentration (as a percent)			14.00%
Servicio de Administaction Tributaria ("SAT") in Mexico | Revenue | Customer Concentration Risk
Operations and identifiable assets by industry segment
Concentration (as a percent)			10.00%	10.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Total revenues	202,437	188,684	$ 391,401	$ 358,644
Income (Loss) from Operations	28,562	26,063	48,880	49,113
Segments assets	815,336		815,336		793,810
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	41,992	51,559	82,200	89,832
Income (Loss) from Operations	1,294	2,209	4,111	334
Segments assets	193,617		193,617		157,639
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	72,806	72,019	146,444	142,973
Income (Loss) from Operations	9,018	8,067	17,787	14,892
Segments assets	241,321		241,321		237,851
Corporate
Operations and identifiable assets by industry segment
Income (Loss) from Operations	(6,080)	(4,560)	(13,417)	(15,911)
Segments assets	93,612		93,612		79,498
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(11,893)	(9,057)	(23,851)	(21,995)
Income (Loss) from Operations	125	$ (72)	445	$ (464)
Segments assets	$ (41,960)		$ (41,960)		$ (3,934)

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