Debt - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Line of Credit Facility [Line Items]
Line of credit, current borrowing capacity	$ 200,000
Line of credit, maximum borrowing capacity	400,000
Line of credit facility, maximum amount outstanding during period	75,000
Revolver Amount Drawn to Fund Code Acquisition	75,000
Revolver repaid during year related to Code Acquistion	37,000
Line of credit, remaining borrowing capacity	159,100
Line of credit, remaining maximum borrowing capacity	$ 359,100
Debt to EBITDA Ratio	0.2 to 1.0
Interest Expense Coverage Ratio	480.6 to 1.0
Letters of credit outstanding	$ 2,901	$ 3,116
Line of Credit Facility, Interest Rate Description	Under this revolving loan agreement, the Company has the option to select either a Eurocurrency rate loan that bears interest at the LIBOR rate plus a margin based on the Company's consolidated net leverage ratio or a base interest rate (based upon the higher of the federal funds rate plus 0.5%, the prime rate of the Bank of Montreal plus a margin based on the Company’s consolidated net leverage ratio, or the Eurocurrency base rate at the LIBOR rate plus a margin based on the Company’s consolidated net leverage ratio plus 1%).