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Stockholders' Equity (Tables) | 3 Months Ended
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Jul. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity for the three months ended July 31, 2013 is as follows:
|  | Stock Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding, April 30, 2013 |  |  | 1,442 |  |  | $ | 8.48 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  | $ | — |  |  |  |  |  |  | $ | — |
Forfeited |  |  | (20 | ) |  | $ | 9.26 |  |  |  |  |  |  |  |  |
Outstanding, July 31, 2013 |  |  | 1,422 |  |  | $ | 8.58 |  |  |  | 5.2 |  |  | $ | 502 |
Exercisable, July 31, 2013 |  |  | 1,068 |  |  | $ | 10.07 |  |  |  | 3.8 |  |  | $ | 257 |
Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity | A summary of restricted stock, restricted stock unit and performance stock unit activity for the three months ended July 31, 2013 is as follows:
|  | 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 |  |  | 475 |  |  | $ | 4.07 |  |  |  |  |  |  |  |  |
Class A Common Stock Vested |  |  | (254 | ) |  | $ | 4.85 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (5 | ) |  | $ | 5.39 |  |  |  |  |  |  |  |  |
Outstanding, July 31, 2013 |  |  | 1,304 |  |  | $ | 4.92 |  |  |  | 1.9 |  |  | $ | 358 |
(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 356 shares of Class A common stock.
Accumulated Other Comprehensive Income Loss | The changes in the balances of each component of accumulated other comprehensive loss, which is included as a component of our stockholders’ equity, are as follows:
|  | Marketable |  |  | Commodity |
|  | Securities |  |  | Hedges |
Beginning balance, April 30, 2013 |  | $ | 27 |  |  | $ | (619 | )
Other comprehensive loss before reclassifications |  |  | — |  |  |  | (289 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 164 |
Net current-period other comprehensive loss |  |  | — |  |  |  | (125 | )
Ending balance, July 31, 2013 |  | $ | 27 |  |  | $ | (744 | )
Reclassification out of Accumulated Other Comprehensive Loss | A summary of reclassifications out of accumulated other comprehensive loss for the three months ended July 31, 2013 and 2012 is as follows:
|  | Three Months Ended July 31, |  |  |
|  | 2013 |  |  | 2012 |  |  |
Details about Accumulated Other Comprehensive Loss Components |  | Amount Reclassified Out of Accumulated Other Comprehensive Loss |  |  | Affected Line Item in the Consolidated Statements of Operations
Loss on derivative instruments: |  |  |  |  |  |  |  |  |  |
Commodity hedges |  |  | (164 | ) |  |  | (44 | ) |  | Loss from equity method investments
|  |  | (164 | ) |  |  | (44 | ) |  | Loss from continuing operations before income taxes and discontinued operations
|  |  | — |  |  |  | — |  |  | Provision for income taxes
|  | $ | (164 | ) |  | $ | (44 | ) |  | Loss from continuing operations

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 + Details
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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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