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Fair Value of Financial Instruments and Long Term Debt (Tables) | 12 Months Ended
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Apr. 30, 2015
Fair Value Disclosures [Abstract] |
Carrying Value of Long-Term Debt | The Company’s long-term debt at carrying amount by issuance is as follows:
| As of April 30,
| 2015 |  | 2014
Capitalized lease obligations discounted at 5.22% to 7.09% due in various monthly installments through 2048 (Note 7) | $ | 9,643 |  |  | $ | 10,195 |
5.72% Senior notes due in 14 installments beginning September 30, 2012 and ending March 30, 2020 | 75,000 |  |  | 75,000 |
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 |
| 853,643 |  |  | 854,195 |
Less current maturities | 15,398 |  |  | 553 |
| $ | 838,245 |  |  | $ | 853,642 |
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, 2015 and thereafter:
Years ended April 30, | Capital Leases |  | Senior Notes |  | Total
2016 | $ | 398 |  |  | $ | 15,000 |  |  | $ | 15,398 |
2017 | 375 |  |  | 15,000 |  |  | 15,375 |
2018 | 396 |  |  | 15,000 |  |  | 15,396 |
2019 | 417 |  |  | 15,000 |  |  | 15,417 |
2020 | 441 |  |  | 15,000 |  |  | 15,441 |
Thereafter | 7,616 |  |  | 769,000 |  |  | 776,616 |
| $ | 9,643 |  |  | $ | 844,000 |  |  | $ | 853,643 |

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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://www.xbrl.org/2003/role/presentationRef -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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