Schedule of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.0	$ 0.7	$ 8.5	$ 0.7
2016 Actions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	0.0	6.2	0.0
2015 Actions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6	0.7	2.3	0.7
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.9	0.7	4.1	0.7
Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.1	$ 0.0	$ 4.4	$ 0.0