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Other Accrued Liabilities - Components of Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Other Accrued Liabilities [Line Items]
Maine Energy impairment reserve	$ 4,500
Other accrued liabilities	16,514	14,119
Total other accrued liabilities	$ 21,014	$ 14,119

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.

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