Intangible assets and goodwill (Tables)

9 Months Ended

Apr. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Finite-Lived Intangible Assets

Finite-lived intangible assets are summarized as follows:

		As of April 30, 2017						As of July 31, 2016
(in millions)	Weighted Average Amortization Period	Cost		Accumulated Amortization/ Write-Offs		Net		Cost		Accumulated Amortization		Net
Developed technologies	10 years	$	17.7	$	13.9	$	3.8	$	29.9	$	15.1	$	14.8
Customer relationships	13 years		43.7		27.7		16.0		47.1		25.2		21.9
Trade names	3 years		0.9		0.9		-		1.9		1.0		0.9
Total finite-lived intangible assets		$	62.3	$	42.5	$	19.8	$	78.9	$	41.3	$	37.6

Estimated Future Amortization Expense Related to Intangible Assets

The estimated future amortization expense related to intangible assets for the five succeeding fiscal years is expected to be as follows:

	Estimated
	Future
	Amortization
(in millions)	Expense
Remaining 2017	$	1.5
2018	$	5.0
2019	$	3.8
2020	$	3.4
2021	$	3.0
Thereafter	$	3.1
	$	19.8

Changes in the Carrying Amount of Goodwill by Reportable Segments

Changes in the carrying amount of goodwill by reportable segments for the nine months ended April 30, 2017 are as follows:

(in millions)	Medical Imaging		Ultrasound			Security and Detection		Total Goodwill
Balance as of July 31, 2016
Goodwill	$	1.8	$	71.6		$	0.5	$	73.9
Impairment losses		-		(71.6	)		-		(71.6	)
Balance as of April 30, 2017
Goodwill		1.8		71.6			0.5		73.9
Accumulated impairment losses		-		(71.6	)		-		(71.6	)
	$	1.8	$	-		$	0.5	$	2.3