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Long-Term Debt - Components of Long-Term Debt and Capital Leases (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
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Oct. 31, 2014 | Apr. 30, 2014
Senior Secured Revolving Credit Facility, Due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Mar. 31, 2016 |
Debt instrument stated percentage | 3.75% |
Senior Subordinated Notes Due 2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Feb. 28, 2019 |
Debt instrument stated percentage | 7.75% |
Senior second lien notes, unamortized discount | $ 1,363 | $ 1,491
Revenue Bonds Series 2005R-2, due January 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 2036 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Apr. 01, 2036 |
Debt instrument stated percentage | 4.75% |
Revenue Bond Series 2013 Due April 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Apr. 01, 2029 |
Debt instrument stated percentage | 4.00% |
Revenue Bonds Series, 2005R-1, Due January 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Jan. 01, 2025 |
Revenue Bonds Series 2013 Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, due date | Jan. 01, 2029 |
Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument maturity date | Apr. 30, 2017 |
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument maturity date | Apr. 30, 2023 |

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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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- 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 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=34725769&loc=d3e28878-108400 + Details
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