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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Debt Instrument [Line Items]    
2020 $ 2,285  
2021 1,860  
2022 28,465  
2023 313,191  
2024 754  
2025 and thereafter 356,750  
Total 703,305  
Debt issuance costs (11,814)  
Current maturities (2,286) $ (4,143)
Total long-term debt 689,205 $ 809,897
Term Loans [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 27,500  
2023 312,500  
2024 0  
2025 and thereafter 0  
Total 340,000  
Senior Notes [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 0  
2023 0  
2024 0  
2025 and thereafter 350,000  
Total 350,000  
Economic Development Loans [Member]    
Debt Instrument [Line Items]    
2020 2,285  
2021 1,860  
2022 965  
2023 679  
2024 690  
2025 and thereafter 166  
Total 6,645  
Other Long-term Debt [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 0  
2023 12  
2024 64  
2025 and thereafter 6,584  
Total $ 6,660