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Investments In Unconsolidated Entities (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended
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Jan. 31, 2012 | Jan. 31, 2012 | Jan. 31, 2013 Recycle Rewards Inc [Member] | Apr. 30, 2012 Recycle Rewards Inc [Member] | Jan. 31, 2013 AGreen [Member] | Apr. 30, 2012 AGreen [Member] | Jan. 31, 2013 GreenerU [Member] | Apr. 30, 2012 GreenerU [Member] | Jan. 31, 2013 Evergreen National Indemnity Company [Member] | Apr. 30, 2012 Evergreen National Indemnity Company [Member] | May 31, 2012 Green Fiber [Member] | Jan. 31, 2012 Green Fiber [Member] | Jan. 31, 2013 Green Fiber [Member] | Apr. 30, 2012 Green Fiber [Member] | May 31, 2011 Tompkins County Recycling LLC [Member] | Jan. 31, 2013 Tompkins County Recycling LLC [Member] | Apr. 30, 2012 Tompkins County Recycling LLC [Member] | May 31, 2011 Tompkins County Recycling LLC [Member] FCRLLC [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity-method ownership interest |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  | 50.00% | 50.00%
Guaranty issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200 |  |  |  |  |
Fair value of guaranty |  |  |  |  |  |  |  |  |  |  |  |  | 264 |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | 5,090 |  |  |  |  |  |
Impairment of equity method investment | 10,680 | 10,680 |  |  |  |  |  |  |  |  |  | 10,680 |  |  |  |  |  |
Equity contribution |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  | 285 |  |  | 285
Equity method investments |  |  |  |  |  |  |  |  |  |  |  |  | 2,638 | 6,502 |  | 307 | 292 |
Cost method investments |  |  | 4,479 | 4,479 | 350 | 350 | 1,000 | 500 | 10,657 | 10,657 |  |  |  |  |  |  |  |
Ownership interest |  |  | 6.00% | 6.20% | 11.90% | 11.90% | 6.30% | 4.20% | 19.90% | 19.90% |  |  |  |  |  |  |  |
Payments to acquire cost method investments |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |

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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 FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of contractual guarantees to which the Company is obligated as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 3, 8, 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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