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Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2020
Apr. 30, 2019
ROU Assets and Liabilities [Abstract]      
Operating lease right-of-use assets $ 142,308 $ 142,308 $ 0
Short-term portion of operating lease liabilities 18,950 18,950 0
Operating lease liabilities, non-current 160,781 160,781 0
Increase (decrease) in right of use assets   13,300  
Increase (decrease) in operating lease liabilities   14,900  
Net Lease Costs [Abstract]      
Operating lease cost 6,286 19,346  
Variable lease cost 1,004 3,122  
Sublease income (180) (519)  
Total net lease cost $ 7,110 $ 21,949  
Other Supplemental Information [Abstract]      
Weighted-average remaining contractual lease term, operating leases 10 years 10 years  
Weighted-average discount rate, operating leases 5.91% 5.91%  
Cash paid for amounts included in the measurement of lease liabilities [Abstract]      
Operating cash flows from operating leases   $ 22,029  
Reconciliation of Undiscounted Cash Flows to Operating Lease Liabilities [Abstract]      
2020 (remaining 3 months) $ 9,372 9,372  
2021 28,426 28,426  
2022 25,386 25,386  
2023 22,938 22,938  
2024 22,061 22,061  
Thereafter 135,373 135,373  
Total undiscounted lease payments 243,556 243,556  
Less: Imputed interest 63,825 63,825  
Present value of minimum lease payments 179,731 179,731  
Less: Current portion 18,950 18,950 0
Noncurrent portion $ 160,781 $ 160,781 $ 0