Credit Facilities (Details)	12 Months Ended
	Jul. 31, 2016 USD ($) credit_facility	Jul. 31, 2016 EUR (€)	Jul. 31, 2015 USD ($)	Oct. 28, 2014 USD ($)
Line of Credit Facility [Line Items]
Number of uncommitted credit facilities | credit_facility	2
European Operations
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 48,900,000	€ 44,000,000.0	$ 37,400,000
Long-term Line of Credit	0		10,400,000
Uncommitted Credit Facilities
Line of Credit Facility [Line Items]
Long-term Line of Credit	26,800,000		15,300,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 38,200,000		49,700,000
Short-term Debt, Weighted Average Interest Rate	1.25%	1.25%
Treasury Notes
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 111,100,000	€ 100,000,000.0	109,900,000
Long-term Line of Credit	0		0
Subsidiaries
Line of Credit Facility [Line Items]
Long-term Line of Credit	8,700,000		1,600,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 45,500,000		$ 47,200,000
Short-term Debt, Weighted Average Interest Rate	0.32%	0.32%	0.41%
Multi Currency Revolving Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Period	5 years
Line of Credit Facility, Maximum Borrowing Capacity				$ 400,000,000.0
Long-term Line of Credit	$ 130,000,000		$ 160,000,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 262,700,000		$ 232,200,000