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Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2019
Apr. 30, 2019
ROU Assets and Liabilities [Abstract]    
Operating Lease Right-Of-Use Assets $ 147,370 $ 0
Short-term portion of operating lease liabilities 18,041 0
Operating Lease Liabilities, non-current 166,642 0
Increase (decrease) in right of use assets 10,300  
Increase (decrease) in operating lease liabilities 11,900  
Net Lease Costs [Abstract]    
Operating lease cost 6,861  
Variable lease cost 1,203  
Sublease income (523)  
Total net lease cost $ 7,541  
Other Supplemental Information [Abstract]    
Weighted-average remaining contractual lease term, operating leases 10 years  
Weighted-average discount rate, operating leases 5.82%  
Cash paid for amounts included in the measurement of lease liabilities [Abstract]    
Operating cash flows from operating leases $ 7,300  
Reconciliation of Undiscounted Cash Flows to Operating Lease Liabilities [Abstract]    
2020 (remaining 9 months) 23,920  
2021 27,376  
2022 24,446  
2023 22,109  
2024 21,651  
Thereafter 133,534  
Total undiscounted lease payments 253,036  
Less: Imputed interest 68,353  
Present value of minimum lease payments 184,683  
Less: Current portion 18,041 0
Noncurrent portion $ 166,642 $ 0