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Long-Term Debt and Capital Leases - Components of Long-Term Debt and Capital Leases (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Apr. 30, 2014 | Apr. 30, 2013
Senior Subordinated Notes Due 2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Feb. 15, 2019 |
Debt instrument stated percentage | 7.75% |
Senior second lien notes, unamortized discount | $ 1,491 | $ 1,735
Senior Secured Revolving Credit Facility, Due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit | 227,500 |
Debt instrument, due date | Mar. 18, 2016 |
Interest at LIBOR | 3.75% |
Debt instrument, interest rate at period end | 3.90% |
Revenue Bonds Series, 2005R-1, Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Jan. 01, 2025 |
Debt instrument, interest rate at period end | 0.18% |
Revenue Bonds Series 2005R-2, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Jan. 01, 2025 |
Debt instrument stated percentage | 6.25% |
Long-Term Revenue Bonds Series 2013 Due April 1, 2036 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Apr. 01, 2036 |
Debt instrument stated percentage | 4.75% |
Revenue Bonds Series 2013 Due April 1, 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Apr. 01, 2029 |
Debt instrument, interest rate at period end | 0.18% |
Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 6.00% |
Debt instrument lease installments | 120 |
Debt instrument maturity date | Apr. 30, 2017 |
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 7.70% |
Debt instrument lease installments | $ 935 |
Debt instrument maturity date | Apr. 30, 2023 |
Standby Letters of Credit [Member] | Revenue Bonds Series, 2005R-1, Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate at period end | 3.875% |
Standby Letters of Credit [Member] | Revenue Bonds Series 2013 Due April 1, 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate at period end | 3.875% |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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