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Fair Value of Financial Instruments and Long Term Debt - Carrying Value of Long-term Debt (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 USD ($) installment_payment | Apr. 30, 2015 USD ($) installment_payment
Debt Instrument |  |
Long-term debt | $ 838,244 | $ 853,643
Less current maturities | 15,375 | 15,398
Long-term debt, net of current maturities | 822,869 | 838,245
Capital Lease Obligations |  |
Debt Instrument |  |
Capitalized lease obligations | 9,244 | $ 9,643
Long-term debt | $ 9,244 |
Capital Lease Obligations | Minimum |  |
Debt Instrument |  |
Discount rate | 5.22% | 5.22%
Capital Lease Obligations | Maximum |  |
Debt Instrument |  |
Discount rate | 7.09% | 7.09%
Senior Notes |  |
Debt Instrument |  |
Long-term debt | $ 829,000 |
Senior Notes | 5.72% Senior notes due in 14 installments beginning September 30, 2012 and ending March 30, 2020 |  |
Debt Instrument |  |
Long-term debt | $ 60,000 | $ 75,000
Interest rate | 5.72% | 5.72%
Number of payments | installment_payment | 14 | 14
Senior Notes | 5.22% Senior notes due August 9, 2020 |  |
Debt Instrument |  |
Long-term debt | $ 569,000 | $ 569,000
Interest rate | 5.22% | 5.22%
Senior Notes | 3.67% Senior notes (Series A) due in 7 installments beginning June 17, 2022, and ending June 15, 2028 |  |
Debt Instrument |  |
Long-term debt | $ 150,000 | $ 150,000
Interest rate | 3.67% | 3.67%
Number of payments | installment_payment | 7 | 7
Senior Notes | 3.75% Senior notes (Series B) due in 7 installments beginning December 17, 2022 and ending December 18, 2028 |  |
Debt Instrument |  |
Long-term debt | $ 50,000 | $ 50,000
Interest rate | 3.75% | 3.75%
Number of payments | installment_payment | 7 | 7

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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