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Long-Term Debt and Capital Leases - Components of Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Schedule Of Interest Expenses [Line Items]
Interest expense on debt, capital lease and financing lease obligations	$ 36,955	$ 40,156	$ 42,021
Amortization of debt financing costs	3,325	3,307	3,424
Amortization of debt discounts	626	964	801
Amortization of debt premium			(611)
Letter of credit fees	1,032	988	986
Less: capitalized interest	(368)	(407)	(1,078)
Total interest expense	$ 41,570	$ 45,008	$ 45,543

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Amount of noncash expense included in interest expense to amortize the debt discount associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of noncash income included in interest expense to amortize the debt premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of letters of credit fees included in interest expense.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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-Number 210

-Section 04

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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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Total interest expense on long-term debt and capital securities.

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