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Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision for Doubtful Accounts $ 70,569 $ 74,489 $ 52,776
Allowance for Doubtful Accounts [Roll Forward]      
Beginning balance 81,813 56,675 58,390
Charge-offs, recoveries and other (70,909) (49,351) (54,491)
Ending balance 81,473 81,813 56,675
EAs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision for Doubtful Accounts 17,272 16,499 12,713
Allowance for Doubtful Accounts [Roll Forward]      
Beginning balance 26,622 10,123 9,007
Charge-offs, recoveries and other (16,359) 0 (11,597)
Ending balance 27,535 26,622 10,123
All Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision for Doubtful Accounts 53,297 57,990 40,063
Allowance for Doubtful Accounts [Roll Forward]      
Beginning balance 55,191 46,552 49,383
Charge-offs, recoveries and other (54,550) (49,351) (42,894)
Ending balance $ 53,938 $ 55,191 $ 46,552