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Convertible Senior Notes - Net carrying value of the liability component (Details) - Senior Notes - Convertible Debt - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021
Debt Instrument [Line Items]
Principal	$ 400,000	$ 400,000
Debt discount	47,022	50,198
Debt issuance costs	5,629	5,977
Net carrying amount	$ 347,349	$ 343,825

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