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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
2018 | $ 4,137 |
2019 | 36,874 |
2020 | 51,431 |
2021 | 63,414 |
2022 | 313,346 |
2023 and thereafter | 359,142 |
Total | 828,344 |
Debt issuance costs | (14,304) |
Current maturities | (4,143) | $ (1,598)
Total long-term debt | 809,897 | $ 15,279
Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 0 |
2019 | 35,000 |
2020 | 50,000 |
2021 | 62,500 |
2022 | 312,500 |
2023 and thereafter | 0 |
Total | 460,000 |
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 and thereafter | 350,000 |
Total | 350,000 |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 2,189 |
2019 | 88 |
2020 | 89 |
2021 | 201 |
2022 | 207 |
2023 and thereafter | 1,665 |
Total | 4,439 |
Economic Development Loans [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 1,948 |
2019 | 1,786 |
2020 | 1,342 |
2021 | 713 |
2022 | 639 |
2023 and thereafter | 817 |
Total | 7,245 |
Other Long-term Debt [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 and thereafter | 6,660 |
Total | $ 6,660 |

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