Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate	21.00%
Valuation allowance for deferred tax assets	$ 1,002,546	$ 918,689
Valuation allowance increase	83,900	$ 206,600
Unrecognized tax benefits that would impact effective tax rate	14,400
Cash and cash equivalents in foreign subsidiaries	165,900
Accounts payable and accrued liabilities	5,300
United States of America, Dollars
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets	1,000,000
Cash and cash equivalents in foreign subsidiaries	73,100
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,000,000
Federal | Research Credit Carryforwards
Operating Loss Carryforwards [Line Items]
Research credit carryforwards	124,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,800,000
State | Research Credit Carryforwards
Operating Loss Carryforwards [Line Items]
Research credit carryforwards	96,400
Foreign Tax Authority | Research Credit Carryforwards
Operating Loss Carryforwards [Line Items]
Research credit carryforwards	$ 12,100