Fair Value Measurements (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 1,019,239	$ 754,300
Assets, Fair Value Disclosure	1,019,239	754,300
Total Liabilities	399,742	399,733
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,019,249	754,304
Assets, Fair Value Disclosure	1,019,249	754,304
Total Liabilities	422,386	432,027
Fixed Rate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	399,742	399,733
Fixed Rate Debt | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term fixed rate debt, including current portion	$ 422,386	$ 432,027