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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) customer segment	Sep. 30, 2019 USD ($) customer	Jun. 30, 2020 USD ($) customer
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment	3
Total revenues	$ 254,908	$ 290,852
Income (loss) from operations	16,693	$ 24,887
Segments assets	$ 1,270,948		$ 1,268,541
Revenue | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer	0	0
Concentration (as a percent)	10.00%	10.00%
Accounts receivable | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer	1		1
Concentration (as a percent)	11.00%		13.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Total revenues	$ 134,775	$ 188,964
Income (loss) from operations	8,906	20,318
Segments assets	739,269		$ 758,054
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	51,503	40,208
Income (loss) from operations	8,984	2,817
Segments assets	215,320		208,857
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	79,914	73,638
Income (loss) from operations	8,740	8,769
Segments assets	248,909		232,408
Corporate
Operations and identifiable assets by industry segment
Income (loss) from operations	(9,456)	(7,337)
Segments assets	107,213		109,178
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(11,284)	(11,958)
Income (loss) from operations	(481)	$ 320
Segments assets	$ (39,763)		$ (39,956)

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