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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, 2014	Apr. 30, 2013	Apr. 30, 2012
Interest Expense, Debt [Abstract]
Interest expense on debt and capital lease obligations	$ 34,216	$ 36,955	$ 40,156
Amortization of debt financing costs	2,757	3,325	3,307
Amortization of debt discounts	243	626	964
Letter of credit fees	1,215	1,032	988
Less: capitalized interest	(256)	(368)	(407)
Total interest expense	$ 38,175	$ 41,570	$ 45,008

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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 amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash 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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Amount of the cost of borrowed funds accounted for as interest expense.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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