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Leases - Schedule of Assets and Liabilities Related to Operating and Financing Leases (Detail) - USD ($)
$ in Thousands
Jul. 31, 2021
Apr. 30, 2021
Operating Leases    
Right-of-use assets $ 7,154  
Accumulated amortization (2,631)  
Right-of-use assets, net $ 4,523  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets  
Current liabilities $ 1,349 $ 1,309
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and deferred revenue  
Non-current liabilities $ 3,344  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other non-current liabilities  
Total operating lease liabilities $ 4,693  
Finance Leases    
Right-of-use assets 40,986  
Accumulated depreciation (4,757)  
Right-of-use assets, net $ 36,229  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, plant, and equipment, net  
Current liabilities $ 1,101 1,087
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and deferred revenue  
Non-current liabilities $ 38,509 $ 38,786
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current liabilities  
Total finance lease liabilities $ 39,610