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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, 2018 USD ($) installment_payment | Apr. 30, 2017 USD ($) installment_payment
Debt Instrument |  |
Long-term debt | $ 1,307,099 | $ 922,777
Less current maturities | 15,374 | 15,421
Long-term debt, net of current maturities | 1,291,725 | 907,356
Capital Lease Obligations |  |
Debt Instrument |  |
Capitalized lease obligations | 8,099 | 8,777
Long-term debt | 8,099 |
Senior Notes |  |
Debt Instrument |  |
Long-term debt | 1,299,000 |
Senior Notes | 5.72% Senior notes due in 14 installments beginning September 30, 2012 and ending March 30, 2020 |  |
Debt Instrument |  |
Long-term debt | $ 30,000 | $ 45,000
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
Senior Notes | 3.65% Senior notes (Series C) due in 7 installments beginning May 2, 2025 and ending May 2, 2031 |  |
Debt Instrument |  |
Long-term debt | $ 50,000 | $ 50,000
Interest rate | 3.65% | 3.65%
Number of payments | installment_payment | 7 | 7
Senior Notes | 3.72% Senior notes (Series D) due in 7 installments beginning October 28, 2025 and ending October 28, 2031 |  |
Debt Instrument |  |
Long-term debt | $ 50,000 | $ 50,000
Interest rate | 3.72% | 3.72%
Number of payments | installment_payment | 7 | 7
Senior Notes | 3.51% Senior notes (Series E) due June 13, 2025 |  |
Debt Instrument |  |
Long-term debt | $ 150,000 | $ 0
Interest rate | 3.51% |
Senior Notes | 3.77% Senior notes (Series F) due August 22, 2028 |  |
Debt Instrument |  |
Long-term debt | $ 250,000 | $ 0
Interest rate | 3.77% |
Measurement Input, Discount Rate [Member] | Capital Lease Obligations | Minimum |  |
Debt Instrument |  |
Discount rate | 0.0370 | 0.0370
Measurement Input, Discount Rate [Member] | Capital Lease Obligations | Maximum |  |
Debt Instrument |  |
Discount rate | 0.0600 | 0.0600

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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