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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Capitalized interest |  |  |  | $ 368 | $ 407 | $ 1,078
Estimate of inflation rate |  |  |  | 2.70% | 2.70% |
Maximum rate of asset retirement obligation | 10.00% |  |  | 10.00% |  |
Minimum rate of asset retirement obligation | 8.50% |  |  | 8.50% |  |
Accretion expense |  |  |  | (3,538) | (3,341) |
Goodwill impairment incurred |  |  |  | 0 | 0 | 0
Estimated useful life of goodwill |  |  |  | 10 years |  |
Asset impairment charge |  | 40,746 | 3,654 |  | 40,746 | 3,654
Buyers borrowing rate |  | 3.50% |  |  |  |
Recognize loss associated with fair value discontinued operation | 3,261 |  |  |  |  |
Maximum exposure workers' compensation plan per individual event |  |  |  | 1,000 |  |
Self insurance reserves | 11,362 | 12,024 |  | 11,362 | 12,024 |
Maximum cash equivalents maturity period | Three months |  |  |  |  |
Inventory of finished goods and supplies | 3,494 | 3,503 |  | 3,494 | 3,503 |
Impairment of equity method investment |  |  |  |  | 10,680 |
Equity method investment | 3,766 | 6,795 |  | 3,766 | 6,795 |
Derivative instrument interest rate | 6.70% |  |  | 6.70% |  |
Total notional amount | 150,000 |  |  | 150,000 |  |
LIBOR base rate | 1.40% |  |  | 1.40% |  |
Derivative Instrument maturity term |  |  |  | Mar. 15, 2016 |  |
Interest rate derivative agreements and discontinued hedge | 75,000 |  |  | 75,000 |  |
Loss on derivative instruments |  |  |  | 3,626 |  |
Concentration of credit risk |  |  |  | At April 30, 2013 and 2012, no single group or customer represented greater than 5% of total accounts receivable-trade. |  |
Maximum percentage of accounts receivable represented by single group or customer | 5.00% |  |  | 5.00% |  |
Second Lien Notes [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative instrument interest rate |  | 11.00% |  |  | 11.00% |
GreenFiber [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill impairment incurred |  |  |  |  | 5,090 |
Asset impairment charge |  |  |  | 531 |  |
Equity method investment membership interest | 50.00% |  |  | 50.00% |  |
Impairment of equity method investment |  |  |  |  | 10,680 |
Equity method investment | 3,509 | 6,502 |  | 3,509 | 6,502 |
Loan and security agreement guaranty | 2,200 |  |  | 2,200 |  |
Payment to satisfy the guaranty and pay off the term loan in full |  |  |  | 2,073 |  |
Additional equity method investment | 2,073 |  |  | 2,073 |  |
Tompkins [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity method investment membership interest | 50.00% |  |  | 50.00% |  |
Equity method investment | 257 | 293 |  | 257 | 293 |
Automobile Plan [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Maximum exposure workers' compensation plan per individual event |  |  |  | 750 |  |
Buildings [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 30 years |  |
Buildings [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 25 years |  |
Machinery and equipment [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 10 years |  |
Machinery and equipment [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 5 years |  |
Maintenance equipment [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 10 years |  |
Maintenance equipment [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 5 years |  |
Rolling stock [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 10 years |  |
Rolling stock [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 5 years |  |
Containers [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 12 years |  |
Size of containers |  |  |  | 40 |  |
Containers [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 5 years |  |
Size of containers |  |  |  | 2 |  |
Residential Carts And Recycling Bins [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 10 years |  |
Residential Carts And Recycling Bins [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  |  | 5 years |  |
Landfills [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accretion expense |  |  |  | 3,538 | 3,341 | 3,193
Surety bond |  |  |  | 128,551 | 124,600 |
Letters of credit | $ 1,752 | $ 1,752 |  | $ 1,752 | $ 1,752 |

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- Definition Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 5 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 20 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 + Details
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