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Impairment, restructuring and other charges - Restructuring and other charges(Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		18 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Impairment, restructuring and other charges
Employee termination and facility consolidation costs	$ 500			$ 800
Impairment charges	3,144			3,144	$ 5,418
Acquisition-related costs	361	$ 149		1,181	4,023
Employee termination costs	236	8,747		476	9,218
Facility closures/consolidation	254	96		324	272
Litigation and accrued settlement costs	4,302			4,302
Other charges (reversals)		428			446
Total expensed	8,297	9,420		9,427	19,377
Explosive Trace Detection Business ("ETD")
Impairment, restructuring and other charges
Acquisition-related costs	200			900		$ 1,900
Security Division
Impairment, restructuring and other charges
Impairment charges	1,490		$ 5,400	1,490	5,332
Acquisition-related costs		85			810
Employee termination costs	90	7,657		330	7,807
Facility closures/consolidation	11	3		81	179
Other charges (reversals)					7
Total expensed	1,591	7,745		1,901	14,135
Healthcare Division
Impairment, restructuring and other charges
Impairment charges	579			579	86
Employee termination costs		824			1,080
Facility closures/consolidation	243	69		243	69
Litigation and accrued settlement costs	4,200			4,200
Total expensed	5,022	893		5,022	1,235
Optoelectronics and Manufacturing division
Impairment, restructuring and other charges
Impairment charges	1,075			1,075
Employee termination costs	146	266		146	331
Facility closures/consolidation		24			24
Other charges (reversals)		(67)			(67)
Total expensed	1,221	223		1,221	288
Corporate
Impairment, restructuring and other charges
Acquisition-related costs	361	64		1,181	3,213
Litigation and accrued settlement costs	102			102
Other charges (reversals)		495			506
Total expensed	$ 463	$ 559		$ 1,283	$ 3,719

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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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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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