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Stockholders' Equity (Tables) | 9 Months Ended
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Jan. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity for the nine months ended January 31, 2014 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 |  |  | 157 |  |  | $ | 5.65 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  | $ | — |  |  |  |  |  |  | $ | — |
Forfeited |  |  | (158 | ) |  | $ | 7.28 |  |  |  |  |  |  |  |  |
Outstanding, January 31, 2014 |  |  | 1,441 |  |  | $ | 8.47 |  |  |  | 5.2 |  |  | $ | 613 |
Exercisable, January 31, 2014 |  |  | 1,033 |  |  | $ | 10.05 |  |  |  | 3.6 |  |  | $ | 301 |
Schedule of Fair Values of Stock Options Weighted Average Assumptions | The fair value of stock options grants were estimated assuming no expected dividend yield using the following weighted average assumptions for the three and nine months ended January 31, 2014 and 2013:
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Stock Options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  | 6.79 years |  |  |  | 6.79 years |  |  |  | 6.79 years |  |  |  | 6.79 years |
Risk-free interest rate |  |  | 2.22 | % |  |  | 1.04 | % |  |  | 2.22 | % |  |  | 1.04 | %
Expected volatility |  |  | 83.96 | % |  |  | 84.55 | % |  |  | 83.96 | % |  |  | 84.55 | %
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 nine months ended January 31, 2014 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 |  |  | 539 |  |  | $ | 4.27 |  |  |  |  |  |  |  |  |
Class A Common Stock Vested |  |  | (323 | ) |  | $ | 4.88 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (21 | ) |  | $ | 4.55 |  |  |  |  |  |  |  |  |
Outstanding, January 31, 2014 |  |  | 1,283 |  |  | $ | 4.97 |  |  |  | 1.5 |  |  | $ | 521 |
(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 354 shares of Class A common stock.
Accumulated Other Comprehensive Income (Loss) | The change in the balances of each component of accumulated other comprehensive income (loss), which is included as a component of our stockholders’ equity, is as follows:
|  | Marketable Securities |  |  | Commodity Hedges |
Beginning balance, April 30, 2013 |  | $ | 27 |  |  | $ | (619 | )
Other comprehensive income (loss) before reclassifications |  |  | 11 |  |  |  | (36 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | 655 |
Net current-period other comprehensive income |  |  | 11 |  |  |  | 619 |
Ending balance, January 31, 2014 |  | $ | 38 |  |  | $ | — |
Reclassification out of Accumulated Other Comprehensive Income (Loss) | A summary of reclassifications out of accumulated other comprehensive income (loss) for the three and nine months ended January 31, 2014 and 2013 is as follows:
|  | Three Months Ended January 31, |  |  |
|  | 2014 |  |  | 2013 |  |  |
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: |  |  |  |  |  |  |  |  |  |
Interest rate contracts |  | $ | — |  |  | $ | — |  |  | Loss on derivative instruments
Commodity hedges |  |  | (60 | ) |  |  | (149 | ) |  | Loss from equity method investments
|  |  | (60 | ) |  |  | (149 | ) |  | Loss from continuing operations before income taxes and discontinued operations
|  |  | (250 | ) |  |  | — |  |  | Provision for income taxes
|  | $ | (310 | ) |  | $ | (149 | ) |  | Loss from continuing operations
|  | Nine Months Ended January 31, |  |  |
|  | 2014 |  |  | 2013 |  |  |
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: |  |  |  |  |  |  |  |  |  |
Interest rate contracts |  | $ | — |  |  | $ | (3,625 | ) |  | Loss on derivative instruments
Commodity hedges |  |  | (405 | ) |  |  | (514 | ) |  | Loss from equity method investments
|  |  | (405 | ) |  |  | (4,139 | ) |  | Loss from continuing operations before income taxes and discontinued operations
|  |  | (250 | ) |  |  | — |  |  | Provision for income taxes
|  | $ | (655 | ) |  | $ | (4,139 | ) |  | Loss from continuing operations

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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