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Stockholders' (Deficit) Equity (Tables)

12 Months Ended

Apr. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity for fiscal year 2014.

		Stock Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (years)				Aggregate Intrinsic Value
Outstanding, April 30, 2013			1,442			$	8.48
Granted			157			$	5.65
Exercised			(33	)		$	4.30
Forfeited			(198	)		$	7.03
Outstanding, April 30, 2014			1,368			$	8.65				4.8			$	543
Exercisable, April 30, 2014			1,027			$	10.02				3.4			$	294
Expected to vest, April 30, 2014			1,368			$	8.65				4.8			$	543

Schedule of Fair Value of Stock Options Weighted Average Assumptions

The weighted average fair value of stock options granted during fiscal years 2014, 2013 and 2012 were $4.22, $3.03 and $4.14 per option, respectively, which were calculated assuming no expected dividend yield using the following weighted average assumptions:

		Fiscal Year Ended April 30,
		2014				2013				2012
Expected life			6.79 years				6.82 years				5.50 years
Risk-free interest rate			2.22	%			1.14	%			0.82	%
Expected volatility			83.96	%			84.40	%			91.54	%

Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity

The following table summarizes restricted stock, restricted stock unit and performance stock unit activity for fiscal year 2014.

		Restricted Stock, Restricted Stock Units, and Performance Stock Units (1)				Weighted Average Grant Price				Weighted Average Remaining Contractual Term (years)				Aggregate Intrinsic Value
Outstanding, April 30, 2013			1,088			$	5.28
Granted			542			$	4.28
Class A Common Stock Vested			(327	)		$	4.89
Forfeited			(226	)		$	5.86
Outstanding, April 30, 2014			1,077			$	4.77				1.5			$	500
Expected to vest, April 30, 2014			947			$	4.82				1.5			$	409

(1) Performance stock units are included at the 100% attainment level. Attainment of maximum annual returns on net assets could result in the issuance of an additional 255 shares of Class A common stock.

Summary of Grant Activity for Other Stock Awards

The following table summarizes the grant activity for other stock awards for fiscal years 2014, 2013 and 2012, respectively:

		Granted				Weighted Average Grant Date Fair Value				Unissued at April 30, 2014
Fiscal year 2012 grants
Restricted stock units			305			$	6.12				62
Performance stock units			255			$	6.06				—
Restricted stock awards			51			$	5.83				—
Total			611								62
Fiscal year 2013 grants
Restricted stock units			340			$	5.15				176
Performance stock units			316			$	5.17				255
Restricted stock awards			79			$	4.45				—
Total			735								431
Fiscal year 2014 grants
Restricted stock units			482			$	4.09				454
Restricted stock awards			60			$	5.81				—
Total			542								454

Accumulated Other Comprehensive Loss

The changes in the balances of each component of accumulated other comprehensive income (loss) for fiscal years 2014, 2013 and 2012 are as follows:

		Marketable Securities				Commodity Hedges				Interest Rate Swaps				Total
Balance as of April 30, 2011		$	8			$	370			$	—			$	378
Other comprehensive (loss) income before reclassifications			(4	)			621				(2,369	)			(1,752	)
Amounts reclassified from accumulated other comprehensive income			—				(578	)			—				(578	)
Net current-period other comprehensive (loss) income			(4	)			43				(2,369	)			(2,330	)
Balance as of April 30, 2012			4				413				(2,369	)			(1,952	)
Other comprehensive income (loss) before reclassifications			23				(1,653	)			(1,257	)			(2,887	)
Amounts reclassified from accumulated other comprehensive loss			—				621				3,626				4,247
Net current-period other comprehensive income (loss)			23				(1,032	)			2,369				1,360
Balance as of April 30, 2013			27				(619	)			—				(592	)
Other comprehensive income (loss) before reclassifications			12				(36	)			—				(24	)
Amounts reclassified from accumulated other comprehensive loss			—				655				—				655
Net current-period other comprehensive income			12				619				—				631
Balance as of April 30, 2014		$	39			$	—			$	—			$	39

Reclassification Out of Accumulated Other Comprehensive Income (Loss)

A summary of reclassifications out of accumulated other comprehensive income (loss) for fiscal year 2014, 2013 and 2012 is as follows:

		Fiscal Year Ended April 30,
		2014				2013				2012
Details about Accumulated Other Comprehensive Income (Loss) Components		Amount Reclassified Out of Accumulated Other Comprehensive Income (Loss)												Affected Line Item in the Consolidated Statements of Operations
Loss on derivative instruments:
Comodity Hedges		$	—			$	—			$	130			Revenues
GreenFiber Commodity hedges			(405	)			(621	)			547			Loss from equity method investments
Interest rate contracts			—				(3,626	)			—			Loss on derivative instruments
			(405	)			(4,247	)			677			Loss from continuing operations before income taxes and discontinued operations
			(250	)			—				(99	)		Provision (benefit) for income taxes
		$	(655	)		$	(4,247	)		$	578			Loss from continuing operations

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