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Stockholders' (Deficit) Equity (Tables) | 12 Months Ended
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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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