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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($) customer	Jun. 30, 2018 USD ($)
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment			3
Revenues	$ 304,284	$ 267,299	$ 873,738	$ 801,960
Income (Loss) from Operations	32,120	7,743	80,084	$ 45,284
Assets	1,284,115		1,284,115		$ 1,255,691
Revenue | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer				1
Servicio de Administaction Tributaria ("SAT") in Mexico | Revenue | Customer Concentration Risk
Operations and identifiable assets by industry segment
Concentration (as a percent)				11.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Revenues	193,486	170,270	552,130	$ 504,784
Income (Loss) from Operations	24,943	21,028	74,056	66,192
Assets	798,215		798,215		804,527
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Revenues	48,865	43,758	138,697	141,793
Income (Loss) from Operations	5,418	(8,425)	5,752	(6,975)
Assets	154,212		154,212		167,611
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Revenues	70,927	66,212	213,900	189,024
Income (Loss) from Operations	7,320	6,547	22,212	16,224
Assets	245,176		245,176		220,373
Corporate
Operations and identifiable assets by industry segment
Income (Loss) from Operations	(5,354)	(10,730)	(21,265)	(28,601)
Assets	90,258		90,258		66,453
Eliminations
Operations and identifiable assets by industry segment
Revenues	(8,994)	(12,941)	(30,989)	(33,641)
Income (Loss) from Operations	(207)	$ (677)	(671)	$ (1,556)
Assets	$ (3,746)		$ (3,746)		$ (3,273)

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