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Stockholders' Equity - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Income) loss from equity method investments		$ (91)		$ 887
(Income) loss from continuing operations before income taxes and discontinued operations	(583)	230	(719)	25
Provision for income taxes	(222)	(300)	(512)	(619)
(Income) loss from continuing operations	(361)	530	(207)	644
Commodity Hedges [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Income) loss from continuing operations before income taxes and discontinued operations		(181)		(345)
Provision for income taxes	0	0	0	0
(Income) loss from continuing operations		(181)		(345)
Commodity Hedges [Member] | Commodity Contract [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Income) loss from equity method investments		$ (181)		$ (345)

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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