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Fair Value of Financial Instruments and Long Term Debt (Tables) | 12 Months Ended
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Apr. 30, 2019
Fair Value Disclosures [Abstract] |
Carrying Value of Long-Term Debt | The carrying amount of the Company’s long-term debt and capital lease obligations by issuance is as follows:
| As of April 30,
| 2019 |  | 2018
Capitalized lease obligations discounted at 3.70% to 6.00% due in various monthly installments through 2048 (Note 7) | $ | 16,480 |  |  | $ | 8,099 |
5.72% Senior notes due in 14 installments beginning September 30, 2012 and ending March 30, 2020 | 15,000 |  |  | 30,000 |
5.22% Senior notes due August 9, 2020 | 569,000 |  |  | 569,000 |
3.67% Senior notes (Series A) due in 7 installments beginning June 17, 2022, and ending June 15, 2028 | 150,000 |  |  | 150,000 |
3.75% Senior notes (Series B) due in 7 installments beginning December 17, 2022 and ending December 18, 2028 | 50,000 |  |  | 50,000 |
3.65% Senior notes (Series C) due in 7 installments beginning May 2, 2025 and ending May 2, 2031 | 50,000 |  |  | 50,000 |
3.72% Senior notes (Series D) due in 7 installments beginning October 28, 2025 and ending October 28, 2031 | 50,000 |  |  | 50,000 |
3.51% Senior notes (Series E) due June 13, 2025 | 150,000 |  |  | 150,000 |
3.77% Senior notes (Series F) due August 22, 2028 | 250,000 |  |  | 250,000 |
| 1,300,480 |  |  | 1,307,099 |
Less current maturities | 17,205 |  |  | 15,374 |
| $ | 1,283,275 |  |  | $ | 1,291,725 |
Schedule of Maturities of Long-term Debt Including Capitalized Lease Obligations | Listed below are the aggregate maturities of long-term debt, including capitalized lease obligations, for the 5 years commencing May 1, 2019 and thereafter:
Years ended April 30, | Capital Leases |  | Senior Notes |  | Total
2020 | $ | 2,205 |  |  | $ | 15,000 |  |  | $ | 17,205 |
2021 | 2,320 |  |  | 569,000 |  |  | 571,320 |
2022 | 2,395 |  |  | — |  |  | 2,395 |
2023 | 2,538 |  |  | 20,000 |  |  | 22,538 |
2024 | 2,085 |  |  | 32,000 |  |  | 34,085 |
Thereafter | 4,937 |  |  | 648,000 |  |  | 652,937 |
| $ | 16,480 |  |  | $ | 1,284,000 |  |  | $ | 1,300,480 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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