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Impairment, restructuring and other charges - Restructuring and other charges(Details) $ in Thousands	3 Months Ended			9 Months Ended		18 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018 USD ($) item	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Impairment, restructuring and other charges
Employee termination and facility consolidation costs	$ 400			$ 1,200
Impairment charges	4,037		$ 7,100	7,181	$ 5,418
Acquisition-related costs	77	$ 140		1,258	4,163
Employee termination costs	290	579		766	9,797
Facility closures/consolidation	109	1,478		433	1,750
Legal and accrued settlement costs	9,549			13,851
Other charges (reversals)		311			757
Total expensed	14,062	2,508		23,489	21,885
Explosive Trace Detection Business ("ETD")
Impairment, restructuring and other charges
Acquisition-related costs	200			1,100		$ 2,100
Security Division
Impairment, restructuring and other charges
Impairment charges	91			1,581	5,332
Acquisition-related costs					810
Employee termination costs	18	345		348	8,152
Facility closures/consolidation	117	650		198	829
Other charges (reversals)					7
Total expensed	226	995		$ 2,127	15,130
Healthcare Division
Impairment, restructuring and other charges
Number of non-core product lines abandoned | item				2
Impairment charges	3,946			$ 4,525	86
Employee termination costs	3	182		3	1,262
Facility closures/consolidation	(8)	634		235	703
Legal and accrued settlement costs	5,766			9,966
Other charges (reversals)		297			297
Total expensed	9,707	1,113		14,729	2,348
Optoelectronics and Manufacturing division
Impairment, restructuring and other charges
Impairment charges				1,075
Employee termination costs	269	52		415	383
Facility closures/consolidation		194			218
Other charges (reversals)		19			(48)
Total expensed	269	265		1,490	553
Corporate
Impairment, restructuring and other charges
Acquisition-related costs	77	140		1,258	3,353
Legal and accrued settlement costs	3,783			3,885
Other charges (reversals)		(5)			501
Total expensed	$ 3,860	$ 135		$ 5,143	$ 3,854

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The amount of total cost incurred relating to employee termination and other consolidation activities during the period.

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The number of none-core product lines abandoned during the period.

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Amount of other expenses (reversal of other expenses) associated with exit or disposal activities pursuant to an authorized plan.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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