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Investments in Unconsolidated Entities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  | 1 Months Ended |  |  |  |  | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Apr. 30, 2013 | May 31, 2013 GreenFiber [Member] | Oct. 31, 2013 GreenFiber [Member] | Jun. 28, 2013 GreenFiber [Member] | Apr. 30, 2013 GreenFiber [Member] | Dec. 01, 2011 GreenFiber [Member] | Dec. 05, 2013 GreenFiber [Member] Subsequent Event [Member] | Oct. 31, 2013 Tompkins County Recycling LLC [Member] | Apr. 30, 2013 Tompkins County Recycling LLC [Member]
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity-method ownership interest |  |  |  |  | 50.00% |  |  |  |  | 50.00% |
Equity method investment | $ 2,731 |  | $ 3,766 |  | $ 2,439 |  | $ 3,509 |  |  | $ 291 | $ 257
Loan and security agreement guaranty |  |  |  |  |  | 750 |  | 2,200 |  |  |
Liability in other long-term liabilities |  |  |  |  |  |  | 2,073 |  |  |  |
Payment to satisfy the guaranty and pay off the term loan in full | 2,148 | 1,000 |  | 2,073 |  |  |  |  |  |  |
Total cash consideration |  |  |  |  |  |  |  |  | $ 18,000 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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