Income taxes (Tables)

3 Months Ended

Oct. 31, 2017

Income Tax Disclosure [Abstract]

Provision for Income Taxes and Effective Tax Rate

The following table presents the provision for income taxes and our effective tax rate for the three months ended October 31, 2017 and 2016:

	Three Months Ended
	October 31,
(in millions except percentages)	2017			2016
Provision for income taxes	$	2.5		$	1.0
Effective tax rate		30	%		28	%