Income taxes (Tables)

9 Months Ended

Apr. 30, 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 and nine months ended April 30, 2017 and 2016:

	Three Months Ended						Nine Months Ended
	April 30,						April 30,
(in millions except percentages)	2017			2016			2017			2016
(Benefit)/provision for income taxes	$	(4.9	)	$	1.7		$	(1.9	)	$	2.9
Effective tax rate		8	%		26	%		4	%		46	%