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Goodwill And Intangible Assets (Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 757,659 $ 712,138 $ 519,937
Tax Office Acquisition      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 30,195    
Weighted-Average Life (in years) 4 years    
Tax Office Acquisition | Internally-developed software      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 14,919    
Weighted-Average Life (in years) 3 years    
Tax Office Acquisition | Reacquired franchise rights      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 5,941    
Weighted-Average Life (in years) 5 years    
Tax Office Acquisition | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 8,987    
Weighted-Average Life (in years) 5 years    
Tax Office Acquisition | Noncompete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 348    
Weighted-Average Life (in years) 5 years    
Wave HQ Inc.      
Acquired Finite-Lived Intangible Assets [Line Items]      
Assets acquired and liabilities assumed, net $ 3,928    
Deferred tax liability 8,126    
Total identifiable net assets 99,672    
Goodwill 300,560    
Total identifiable assets and goodwill 400,232    
Wave HQ Inc. | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangibles $ 23,000    
Weighted-Average Life (in years) 5 years    
Wave HQ Inc. | Purchased technology      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangibles $ 68,000    
Weighted-Average Life (in years) 10 years    
Wave HQ Inc. | Noncompete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangibles $ 7,070    
Weighted-Average Life (in years) 5 years    
Wave HQ Inc. | Trade name      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangibles $ 5,800    
Weighted-Average Life (in years) 10 years