Intangible assets and goodwill (Tables)

9 Months Ended

Apr. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Finite-Lived Intangible Assets

Finite-lived intangible assets are summarized as follows:

		As of April 30, 2018						As of July 31, 2017
(in millions)	Weighted Average Amortization Period	Cost		Accumulated Amortization/ Write-Offs		Net		Cost		Accumulated Amortization		Net
Developed technologies	10 years	$	17.7	$	15.6	$	2.1	$	17.7	$	14.4	$	3.3
Customer relationships	13 years		43.7		31.4		12.3		43.7		28.7		15.0
Trade names	3 years		0.9		0.9		-		0.9		0.9		-
Total finite-lived intangible assets		$	62.3	$	47.9	$	14.4	$	62.3	$	44.0	$	18.3

Goodwill Balance by Reportable Segments and Reporting Unit

The goodwill balance by reportable segments and reporting units for the nine months ended April 30, 2018 are as follows:

	Medical Imaging		Ultrasound				Security and Detection
(in millions)	(Medical Imaging Reporting Unit)		(Ultrasound Reporting Unit)		(Oncura Reporting Unit)		(Security and Detection Reporting Unit)		Total Goodwill
Balance as of July 31, 2017	$	1.8	$	-	$	-	$	0.5	$	2.3
Balance as of April 30, 2018	$	1.8	$	-	$	-	$	0.5	$	2.3

Rollforward of Accumulated Goodwill Impairment Losses by Reportable Segment and Reporting Unit

The following is a roll forward of accumulated goodwill impairment losses by reportable segment and reporting unit:

	Medical Imaging		Ultrasound						Security and Detection
(in millions)	(Medical Imaging Reporting Unit)		(Ultrasound ReportingUnit)			(Oncura Reporting Unit)			(Security and Detection Reporting Unit)		Total
Accumulated impairment losses as    of July 31, 2017	$	-	$	(55.2	)	$	(16.4	)	$	-	$	(71.6	)
Accumulated impairment losses    as of April 30, 2018	$	-	$	(55.2	)	$	(16.4	)	$	-	$	(71.6	)