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Leases - Summary of Future Expected Undiscounted Cash Flows (Details)
$ in Thousands
Jul. 31, 2021
USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]  
2022 $ 1,401
2023 1,897
2024 1,930
2025 1,964
2026 1,998
Thereafter 26,514
Total future sublease receipts 35,704
Less amounts representing interest 13,024
Present value of sublease receipts $ 22,680