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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) customer segment	Dec. 31, 2020 USD ($) customer	Jun. 30, 2021 USD ($) customer
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment			3
Total revenues	$ 276,681	$ 276,009	$ 555,938	$ 530,917
Income (loss) from operations	29,086	32,358	53,766	$ 49,051
Segments assets	1,443,106		$ 1,443,106		$ 1,384,367
Number of major customers | customer			0	0	0
One customer | Accounts receivable | Customer Concentration Risk
Operations and identifiable assets by industry segment
Concentration (as a percent)			10.00%		10.00%
International customers | 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	145,918	145,236	$ 295,435	$ 280,011
Income (loss) from operations	18,171	19,776	39,764	28,682
Segments assets	813,139		813,139		$ 798,192
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	52,425	54,895	103,013	106,398
Income (loss) from operations	7,030	9,323	12,950	18,307
Segments assets	228,449		228,449		220,411
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	91,490	87,521	183,795	167,435
Income (loss) from operations	13,382	10,414	23,165	19,154
Segments assets	295,281		295,281		282,039
Corporate
Operations and identifiable assets by industry segment
Income (loss) from operations	(9,663)	(7,361)	(22,126)	(16,817)
Segments assets	142,321		142,321		121,293
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(13,152)	(11,643)	(26,305)	(22,927)
Income (loss) from operations	166	$ 206	13	$ (275)
Segments assets	$ (36,084)		$ (36,084)		$ (37,568)

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