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Business Combinations - Revenue and Income (Details) - Explosive Trace Detection Business ("ETD") - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Combinations
Amount included in revenue	$ 19,700		$ 41,400
Amount included in pre-tax income	2,600		$ 6,600
Pro forma results of operations assume the AS&E acquisition had occurred on July 1, 2016
Revenues	277,528	$ 266,167		$ 534,661	$ 502,918
Income (loss) before taxes	$ 18,147	$ 13,328		$ 37,541	$ 17,769

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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