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Long-Term Debt and Capital Leases - Components of Long Term Debt and Capital Leases (Detail) (USD $) | Apr. 30, 2013 | Apr. 30, 2012
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Debt Instrument [Line Items] |  |
Long Term Debt And Capital Lease Obligations Current And Non Current | $ 494,388,000 | $ 474,609,000
Less-current maturities | 857,000 | 1,228,000
Non Current Portion Of Long Term Debt And Capital Lease Obligation | 493,531,000 | 473,381,000
Senior subordinated notes due 2019 notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes due | 323,265,000 | 200,000,000
Senior secured revolving credit facility, due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Senior secured revolving credit facility | 123,200,000 | 69,600,000
Senior second lien notes, due 2014 [Member] |  |
Debt Instrument [Line Items] |  |
Senior second lien notes due |  | 177,428,000
Revenue Bonds Series 2005R-2, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
FAME Bonds fixed | 21,400,000 | 21,400,000
Long-Term Revenue Bonds Series 2013 due April 1, 2036 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Revenue Fixed | 16,000 |
Revenue Bonds Series 2013 due April 1, 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Revenue Bond Variable | 5,500 | 0
Revenue Bonds Series, 2005R-1, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
FAME Bonds variable | 3,600,000 | 3,600,000
Notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 1,228,000 | 2,033,000
Capital lease obligations [Member] |  |
Debt Instrument [Line Items] |  |
Capital leases for facilities and equipment | $ 195,000 | $ 548,000

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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