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Summary of Significant Accounting Policies (Schedule of Assets Acquired, net of Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Jun. 28, 2019
Oct. 31, 2019
Apr. 30, 2019
Oct. 31, 2018
Apr. 30, 2018
Business Acquisition [Line Items]          
Goodwill   $ 815,331 $ 519,937 $ 507,191 $ 507,871
Wave          
Business Acquisition [Line Items]          
Assets acquired and liabilities assumed, net $ 6,870        
Total identifiable net assets 110,740        
Goodwill 289,492        
Total identifiable assets and goodwill 400,232        
Wave | Purchased technology          
Business Acquisition [Line Items]          
Acquired intangible assets $ 68,000        
Weighted-Average Life (in years) 10 years        
Wave | Customer relationships          
Business Acquisition [Line Items]          
Acquired intangible assets $ 23,000        
Weighted-Average Life (in years) 5 years        
Wave | Noncompete agreements          
Business Acquisition [Line Items]          
Acquired intangible assets $ 7,070        
Weighted-Average Life (in years) 5 years        
Wave | Trade name          
Business Acquisition [Line Items]          
Acquired intangible assets $ 5,800        
Weighted-Average Life (in years) 10 years