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Other Accrued Liabilities - Components of Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
Payables and Accruals [Abstract]
Maine Energy remediation reserve	$ 1,247us-gaap_RestructuringReserveCurrent	$ 2,932us-gaap_RestructuringReserveCurrent	$ 4,500us-gaap_RestructuringReserveCurrent
Other accrued liabilities	15,420us-gaap_OtherSundryLiabilitiesCurrent	14,680us-gaap_OtherSundryLiabilitiesCurrent	16,514us-gaap_OtherSundryLiabilitiesCurrent
Total other accrued liabilities	$ 16,667us-gaap_OtherAccruedLiabilitiesCurrent	$ 17,612us-gaap_OtherAccruedLiabilitiesCurrent	$ 21,014us-gaap_OtherAccruedLiabilitiesCurrent

X

- Definition

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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-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Glossary Current Liabilities

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

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