Goodwill and intangible assets (Tables)

3 Months Ended

Oct. 31, 2016

Intangible Assets

Intangible assets are summarized as follows:

			As of October 31, 2016						As of July 31, 2016
(in millions)	Weighted Average Amortization Period		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Developed technologies		10 years	$	29.9	$	15.9	$	14.0	$	29.9	$	15.1	$	14.8
Customer relationships		13 years		47.1		26.4		20.7		47.1		25.2		21.9
Trade names		3 years		1.9		1.0		0.9		1.9		1.0		0.9
Total finite-lived intangible assets			$	78.9	$	43.3	$	35.6	$	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:

(in millions)	Estimated Future Amortization Expense
Remaining 2017	$	5.9
2018		6.9
2019		5.7
2020		5.3
2021		4.8
Thereafter		7.0
	$	35.6