Intangible assets and goodwill (Tables)

3 Months Ended

Oct. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Finite-Lived Intangible Assets

Finite-lived intangible assets are summarized as follows:

		As of October 31, 2017						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	$	14.8	$	2.9	$	17.7	$	14.4	$	3.3
Customer relationships	13 years		43.7		29.6		14.1		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	$	45.3	$	17.0	$	62.3	$	44.0	$	18.3

Goodwill Balance by Reportable Segments and Reporting Unit

The goodwill balance by reportable segments and reporting unit at both the three months ended October 31, 2017 and July 31, 2017 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 October 31, 2017	$	1.8	$	-	$	-	$	0.5	$	2.3

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

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

	Medical Imaging		Ultrasound						Security and Detection
(in millions)	(Medical Imaging Reporting Unit)		(Ultrasound Reporting Unit)			(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 October 31, 2017	$	-	$	(55.2	)	$	(16.4	)	$	-	$	(71.6	)