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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Debt Instrument [Line Items]    
2020 $ 2,216  
2021 1,345  
2022 245,004  
2023 1,089  
2024 518  
2025 and thereafter 356,174  
Total 606,346 $ 703,305
Debt issuance costs (9,209) (11,814)
Current maturities (2,216) (2,286)
Total long-term debt 594,921 689,205
Term Loans [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 244,000  
2023 0  
2024 0  
2025 and thereafter 0  
Total 244,000 340,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 0  
2023 0  
2024 0  
2025 and thereafter 350,000  
Total 350,000 350,000
Economic Development Loans [Member]    
Debt Instrument [Line Items]    
2020 2,216  
2021 1,345  
2022 958  
2023 836  
2024 262  
2025 and thereafter 70  
Total 5,687 6,645
Other Long-term Debt [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 46  
2023 253  
2024 256  
2025 and thereafter 6,104  
Total $ 6,659 $ 6,660