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Summary Of Significant Accounting Policies (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2017
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Summary Of Significant Accounting Policies [Line Items]        
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 13,800,000 $ 14,300,000 $ 14,800,000
Book overdrafts included in accounts payable $ 29,600,000 29,600,000 43,100,000  
Maximum funding by facility $ 2,000,000,000 $ 2,000,000,000    
Weighted-average life of intangible assets with finite lives (in years)   18 years    
Expenses related to severance benefits   $ 5,600,000 $ 12,000,000 $ 6,700,000
Document Fiscal Year Focus   2017    
Buildings        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life   15 years    
Computers and other equipment        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life 3 years      
Purchased software        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life   3 years    
Leasehold improvements        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life   8 years    
Minimum | Software Development        
Summary Of Significant Accounting Policies [Line Items]        
Weighted-average life of intangible assets with finite lives (in years)   3 years    
Maximum | Software Development        
Summary Of Significant Accounting Policies [Line Items]        
Weighted-average life of intangible assets with finite lives (in years)   5 years    
Maximum | Buildings        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life   40 years    
Maximum | Computers and other equipment        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life 5 years      
H&R Block Emerald Advance® lines of credit        
Summary Of Significant Accounting Policies [Line Items]        
Maximum funding by facility $ 1,000 $ 1,000