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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2013
Estimated Useful Lives of Assets | Property, plant and equipment is recorded at cost, less accumulated depreciation and amortization. We provide for depreciation and amortization using the straight-line method by charges to operations in amounts that allocate the cost of the assets over their estimated useful lives as follows:
Asset Classification |  | Estimated Useful Life |
Buildings |  |  | 25-30 years |
Machinery and equipment |  |  | 5-10 years |
Rolling stock |  |  | 5-10 years |
Containers |  |  | 5-12 years |
Furniture and Fixtures |  |  | 3-8 years |
Schedule of Investments in Unconsolidated Entities | The following table summarizes our equity and cost method investments as of April 30, 2013 and 2012:
|  | April 30, |
|  | 2013 |  |  | 2012 |
Equity method investments |  | $ | 3,766 |  |  | $ | 6,795 |
Cost method investments |  |  | 16,486 |  |  |  | 15,986 |
Investments in unconsolidated entities |  | $ | 20,252 |  |  | $ | 22,781 |
Summarized Balance Sheet Financial Information of Investments in Unconsolidated Affiliates | Summarized financial information for GreenFiber is as follows:
|  | April 30, 2013 |  |  | April 30, 2012 |
Current assets |  | $ | 16,644 |  |  | $ | 17,513 |
Noncurrent assets |  | $ | 28,139 |  |  | $ | 34,597 |
Current liabilities |  | $ | 19,247 |  |  | $ | 12,815 |
Noncurrent liabilities |  | $ | 1,227 |  |  | $ | 5,382
Summarized Income Statement Financial Information of Investments in Unconsolidated Affiliates |
|  | Fiscal Year Ended April 30, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Revenue |  | $ | 67,062 |  |  | $ | 77,544 |  |  | $ | 84,903 |
Gross profit |  | $ | 12,502 |  |  | $ | 10,521 |  |  | $ | 14,025 |
Net loss |  | $ | (8,810) |  |  | $ | (20,003) |  |  | $ | (8,192) |
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss for the fiscal years ended April 30, 2013 and 2012 are shown as follows:
|  | April 30, 2013 |  |  | April 30, 2012 |
|  | Gross |  |  | Tax |  |  | Net |  |  | Gross |  |  | Tax |  |  | Net |
Marketable securities |  | $ | 33 |  |  | $ | (6) |  |  | $ | 27 |  |  | $ | 11 |  |  | $ | (6) |  |  | $ | 5 |
GreenFiber’s commodity hedges |  |  | (370) |  |  |  | (249) |  |  |  | (619) |  |  |  | 661 |  |  |  | (249) |  |  |  | 412 |
Interest rate hedges |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (2,369) |  |  |  | - |  |  |  | (2,369) |
Accumulated other comprehensive loss |  | $ | (337) |  |  | $ | (255) |  |  | $ | (592) |  |  | $ | (1,697) |  |  | $ | (255) |  |  | $ | (1,952) |

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