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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Debt Instrument [Line Items]    
2022 $ 8,322  
2023 7,956  
2024 14,075  
2025 19,338  
2026 470,617  
2027 and thereafter 5,845  
Total 526,153 $ 606,346
Debt issuance costs (4,381) (9,209)
Current maturities (8,322) (2,216)
Total long-term debt 513,450 594,921
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Borrowed under the Credit Agreement 264,000 0
Letter of Credit [Member]    
Debt Instrument [Line Items]    
Borrowed under the Credit Agreement 8,300  
Term Loans [Member]    
Debt Instrument [Line Items]    
2022 6,250  
2023 6,250  
2024 12,500  
2025 18,750  
2026 206,250  
2027 and thereafter 0  
Total 250,000 244,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
2022 0  
2023 0  
2024 0  
2025 0  
2026 0  
2027 and thereafter 0  
Total 0 350,000
Economic Development Loans [Member]    
Debt Instrument [Line Items]    
2022 2,072  
2023 1,660  
2024 1,322  
2025 332  
2026 108  
2027 and thereafter 0  
Total 5,494 5,687
Other Long-term Debt [Member]    
Debt Instrument [Line Items]    
2022 0  
2023 46  
2024 253  
2025 256  
2026 259  
2027 and thereafter 5,845  
Total 6,659 6,659
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
2022 0  
2023 0  
2024 0  
2025 0  
2026 264,000  
2027 and thereafter 0  
Total $ 264,000 $ 0