Intangible assets and goodwill (Tables)

6 Months Ended

Jan. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Finite-Lived Intangible Assets

Finite-lived intangible assets are summarized as follows:

		As of January 31, 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	$	15.2	$	2.5	$	17.7	$	14.4	$	3.3
Customer relationships	13 years		43.7		30.5		13.2		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	$	46.6	$	15.7	$	62.3	$	44.0	$	18.3

Goodwill Balance by Reportable Segments and Reporting Unit

The goodwill balance by reportable segments and reporting units at January 31, 2018 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 January 31, 2018	$	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 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 January 31, 2018	$	-	$	(55.2	)	$	(16.4	)	$	-	$	(71.6	)