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Business Combinations - Intangible Assets (Details) - Explosive Trace Detection Business ("ETD") $ in Thousands	6 Months Ended
	Dec. 31, 2017 USD ($)
Business Combinations
Amortizable assets	$ 29,640
Total intangible assets	30,040
IPR&D
Business Combinations
Non-amortizable asset	$ 400
Developed technology
Business Combinations
Weighted Average Lives (in years)	10 years
Amortizable assets	$ 13,220
Customer relationships
Business Combinations
Weighted Average Lives (in years)	8 years
Amortizable assets	$ 12,920
Backlog
Business Combinations
Weighted Average Lives (in years)	2 years
Amortizable assets	$ 3,500

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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