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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2017 USD ($) segment customer	Sep. 30, 2016 USD ($) customer	Jun. 30, 2017 USD ($)
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment	3
Total revenues	$ 257,133	$ 220,855
Operating income (loss)	19,394	$ 2,099
Segments assets	$ 1,351,524		$ 1,230,087
SAT in Mexico | Revenue | Customer
Operations and identifiable assets by industry segment
Number of major customers | customer	1	1
Percentage of benchmark derived from specified source	13.00%	13.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Total revenues	$ 162,245	$ 123,709
Operating income (loss)	22,693	9,350
Segments assets	899,035		785,230
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	45,529	45,650
Operating income (loss)	847	(3,264)
Segments assets	166,937		186,021
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	58,926	56,954
Operating income (loss)	5,175	4,650
Segments assets	199,617		196,567
Corporate
Operations and identifiable assets by industry segment
Operating income (loss)	(8,753)	(9,013)
Segments assets	89,192		64,959
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(9,567)	(5,458)
Operating income (loss)	(568)	$ 376
Segments assets	$ (3,257)		$ (2,690)

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