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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 | 9 Months Ended |
--- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012
Senior Subordinated Notes Due 2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit due date | Feb. 15, 2019 |
Revenue Bonds Series 2005R-2 bearing interest | 7.75% |
Senior second lien notes, unamortized discount | $ 1,792 | $ 0
Senior Secured Second Lien Notes, Due 2014 [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit due date | Jul. 15, 2014 |
Revenue Bonds Series 2005R-2 bearing interest | 11.00% |
Senior second lien notes, unamortized discount | 0 | 3,536
Senior Secured Revolving Credit Facility, Due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit | 227,500 |
Letters of credit due date | Mar. 18, 2016 |
Interest at LIBOR | 3.75% |
One month LIBOR | 3.96% |
Revenue Bonds Series, 2005R-1, Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit due date | Jan. 01, 2025 |
One month LIBOR | 0.14% |
One month LIBOR | 3.875% |
Revenue Bonds Series 2005R-2, Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit due date | Jan. 01, 2025 |
Revenue Bonds Series 2005R-2 bearing interest | 6.25% |
Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Capital leases interest rate | 2.49% |
Capital leases interest rate | 6.50% |
Capital leases installments | 575 |
Capital Leases maturity date start | May 01, 2013 |
Capital Leases maturity date end | Apr. 30, 2017 |
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Capital leases interest rate | 4.50% |
Capital leases interest rate | 4.72% |
Capital leases installments | $ 78 |
Capital Leases maturity date start | Apr. 01, 2013 |
Capital Leases maturity date end | Jan. 31, 2015 |

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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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