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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
	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%

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- 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))

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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X

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Amount of the required periodic payments including both interest and principal payments.

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-Number 210

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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