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Stockholders' (Deficit) Equity - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 118,927	$ 117,852	$ 132,296	$ 128,558	$ 108,694	$ 112,167	$ 116,836	$ 117,638	$ 106,375	$ 111,520	$ 125,989	$ 124,066	$ 497,633	$ 455,335	$ 467,950
Loss from equity method investments													(936)	(4,441)	(9,994)
Loss on derivative instruments													(280)	(4,512)
Loss from continuing operations before income taxes and discontinued operations													(25,511)	(52,509)	(76,110)
Provision (benefit) for income taxes													(1,799)	2,526	(1,593)
Loss from continuing operations before discontinued operations	(15,633)	(11,033)	(530)	(114)	(9,817)	(11,146)	(20,857)	(8,163)	(48,991)	(24,517)	(693)	(3,502)	(27,310)	(49,983)	(77,703)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on derivative instruments													3,626
Commodity Hedges [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes and discontinued operations													(405)	(4,247)	677
Provision (benefit) for income taxes													(250)		(99)
Loss from continuing operations before discontinued operations													(655)	(4,247)	578
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]
Revenues															130
Commodity Hedges [Member] | Commodity Contract [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | GreenFiber Commodity Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from equity method investments													(405)	(621)	547
Commodity Hedges [Member] | Interest Rate Contracts [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on derivative instruments														$ (3,626)

X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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