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Divestiture and Discontinued Operations (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2012 | Mar. 01, 2011 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 23, 2011 Facility
Divestitures [Line Items] |  |  |  |  |  |  |  |
Undiscounted purchase consideration | $ 6,650 |  |  |  |  |  |  |
Undiscounted purchase consideration paid in installments | 21 years |  |  |  |  |  |  |
Loss on divestiture |  |  | 353 |  |  | 353 |  |
Number of material recovery facilities divested |  |  |  |  |  |  |  | 17
Number of material recovery facilities retained |  |  |  |  |  |  |  | 4
Commodities marketing agreement period |  |  |  |  |  |  |  | 10 years
Percentage of purchaser to market commodities |  |  |  |  |  |  |  | 100.00%
Remaining integrated MRFs |  |  |  |  |  |  |  | 3
Gross proceeds from purchase and sale agreement |  | 134,195 |  |  |  |  |  |
Working capital and other purchase price adjustment |  | 3,795 |  |  |  |  |  |
Gain on disposal of discontinued operations, net of income taxes |  |  |  | $ 79 | $ 646 |  | $ 725 |

X
- Definition The term of our commodities marketing agreement with the purchaser of the divested entity. + References No definition available. + Details
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- Definition The number of facilities related to the divested entity that were retained. + References No definition available. + Details
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- Details
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- Definition The number of material recovery facilities subject to the commodities marketing agreement. + References No definition available. + Details
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- Definition The percentage of tonnage marketed for three of our retained MRFs by the purchaser of the divested entity. + References No definition available. + Details
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- Definition The change in total proceeds received for the divestiture due to a working capital and other purchase price adjustment. + References No definition available. + Details
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- Definition Adjustment, net of tax, to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 44 -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 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759 + Details
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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
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