Debt - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Line of Credit Facilities [Line Items]
Line of credit, maximum borrowing capacity	$ 396,900
Line of credit facility, maximum amount outstanding during period	16,200
Line of credit, remaining borrowing capacity	196,900
Debt Instruments [Abstract]
Letters of credit outstanding	3,116	$ 3,271
Long-term debt, fair value		51,566
Current maturities on long-term debt	$ 0	50,166
Long-term debt		50,166
Euro-denominated notes payable in 2020 at a fixed rate of 4.24% [Member]
Debt Instruments [Abstract]
Debt face amount		$ 45,000