Restructuring Charges (Details) - USD ($)	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7,500,000
Restructuring reserve		$ 0
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,200,000
Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,300,000