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Business Combinations - Revenue and Income (Details) - Explosive Trace Detection Business ("ETD") - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
Business Combinations
Amount included in revenue	$ 17,600		$ 59,000
Amount included in pre-tax income	3,100		$ 9,800
Pro forma results of operations assuming the ETD acquisition had occurred on July 1, 2016
Revenues	267,299	$ 260,695		$ 801,960	$ 763,612
Income from operations	$ 7,743	$ 21,003		$ 45,284	$ 38,772

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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