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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 43,861 | $ 64,171 | $ 48,209
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired | 25,225 | (2,102) | (1,744)
Additions to property, plant and equipment - acquisitions | (1,746) | (529) | (5)
Additions to property, plant and equipment - growth | (12,192) | (12,211) | (2,803)
Additions to property, plant and equipment - maintenance | (40,823) | (45,463) | (51,780)
Payments on landfill operating lease contracts | (6,261) | (6,616) | (5,655)
Payment for capital related to divestiture | (618) |  |
Purchase of gas rights |  |  | (1,608)
Investments in unconsolidated entities | (3,207) | (5,045) |
Proceeds from sale of assets |  |  | 7,533
Proceeds from sale of property and equipment | 883 | 1,492 | 959
Net cash used in investing activities | (89,189) | (70,474) | (55,103)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings | 376,346 | 163,500 | 383,757
Principal payments on long-term debt | (360,858) | (152,806) | (491,669)
Payment of tender premium on second lien notes | (10,743) |  |
Payments of financing costs | (4,609) | (1,592) | (10,588)
Net proceeds from the sale of Class A common stock | 42,184 |  |
Contributions from noncontrolling interest holders | 2,531 | 536 |
Other | 96 | 591 | 605
Intercompany borrowings |  |  |
Net cash provided by (used in) financing activities | 44,947 | 10,229 | (117,895)
Net cash (used in) provided by discontinued operations | (2,398) | (1,209) | 124,571
Net (decrease) increase in cash and cash equivalents | (2,779) | 2,717 | (218)
Cash and cash equivalents, beginning of period | 4,534 | 1,817 | 2,035
Cash and cash equivalents, end of period | 1,755 | 4,534 | 1,817
Parent [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | (5,319) | 4,552 | (49,944)
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired |  |  |
Additions to property, plant and equipment - acquisitions |  |  |
Additions to property, plant and equipment - growth |  |  |
Additions to property, plant and equipment - maintenance | (203) | (574) | (2,328)
Payments on landfill operating lease contracts |  |  |
Payment for capital related to divestiture |  |  |
Purchase of gas rights |  |  |
Investments in unconsolidated entities | (4,166) | (2,740) | 548
Proceeds from sale of assets |  |  |
Proceeds from sale of property and equipment |  |  |
Net cash used in investing activities | (4,369) | (3,314) | (1,780)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings | 334,497 | 163,500 | 382,899
Principal payments on long-term debt | (359,342) | (151,390) | (490,254)
Payment of tender premium on second lien notes | (10,743) |  |
Payments of financing costs | (4,609) | (1,592) | (10,588)
Net proceeds from the sale of Class A common stock | 42,184 |  |
Contributions from noncontrolling interest holders |  |  |
Other | 96 | 591 | 605
Intercompany borrowings | 5,066 | (10,079) | 169,359
Net cash provided by (used in) financing activities | 7,149 | 1,030 | 52,021
Net cash (used in) provided by discontinued operations |  |  |
Net (decrease) increase in cash and cash equivalents | (2,539) | 2,268 | 297
Cash and cash equivalents, beginning of period | 3,799 | 1,531 | 1,234
Cash and cash equivalents, end of period | 1,260 | 3,799 | 1,531
Guarantors [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 50,482 | 59,088 | 97,605
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired | 25,225 | (2,102) | (1,744)
Additions to property, plant and equipment - acquisitions | (1,746) | (529) | (5)
Additions to property, plant and equipment - growth | (7,172) | (9,632) | (2,803)
Additions to property, plant and equipment - maintenance | (40,620) | (44,889) | (49,452)
Payments on landfill operating lease contracts | (6,261) | (6,616) | (5,655)
Payment for capital related to divestiture | (618) |  |
Purchase of gas rights |  |  | (1,608)
Investments in unconsolidated entities | (2,707) | (4,184) |
Proceeds from sale of assets |  |  | 7,533
Proceeds from sale of property and equipment | 883 | 1,492 | 959
Net cash used in investing activities | (83,466) | (66,460) | (52,775)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings | 41,849 |  | 858
Principal payments on long-term debt | (1,516) | (1,416) | (1,415)
Payment of tender premium on second lien notes |  |  |
Payments of financing costs |  |  |
Net proceeds from the sale of Class A common stock |  |  |
Contributions from noncontrolling interest holders |  |  |
Other |  |  |
Intercompany borrowings | (5,066) | 10,079 | (169,359)
Net cash provided by (used in) financing activities | 35,267 | 8,663 | (169,916)
Net cash (used in) provided by discontinued operations | (2,398) | (1,209) | 124,571
Net (decrease) increase in cash and cash equivalents | (115) | 82 | (515)
Cash and cash equivalents, beginning of period | 368 | 286 | 801
Cash and cash equivalents, end of period | 253 | 368 | 286
Non-Guarantors [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | (1,302) | 531 | 548
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired |  |  |
Additions to property, plant and equipment - acquisitions |  |  |
Additions to property, plant and equipment - growth | (5,020) | (2,579) |
Additions to property, plant and equipment - maintenance |  |  |
Payments on landfill operating lease contracts |  |  |
Payment for capital related to divestiture |  |  |
Purchase of gas rights |  |  |
Investments in unconsolidated entities | 3,666 | 1,879 | (548)
Proceeds from sale of assets |  |  |
Proceeds from sale of property and equipment |  |  |
Net cash used in investing activities | (1,354) | (700) | (548)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings |  |  |
Principal payments on long-term debt |  |  |
Payment of tender premium on second lien notes |  |  |
Payments of financing costs |  |  |
Net proceeds from the sale of Class A common stock |  |  |
Contributions from noncontrolling interest holders | 2,531 | 536 |
Other |  |  |
Intercompany borrowings |  |  |
Net cash provided by (used in) financing activities | 2,531 | 536 |
Net cash (used in) provided by discontinued operations |  |  |
Net (decrease) increase in cash and cash equivalents | (125) | 367 |
Cash and cash equivalents, beginning of period | 367 |  |
Cash and cash equivalents, end of period | 242 | 367 |
Elimination [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities |  |  |
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired |  |  |
Additions to property, plant and equipment - acquisitions |  |  |
Additions to property, plant and equipment - growth |  |  |
Additions to property, plant and equipment - maintenance |  |  |
Payments on landfill operating lease contracts |  |  |
Payment for capital related to divestiture |  |  |
Purchase of gas rights |  |  |
Investments in unconsolidated entities |  |  |
Proceeds from sale of assets |  |  |
Proceeds from sale of property and equipment |  |  |
Net cash used in investing activities |  |  |
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings |  |  |
Principal payments on long-term debt |  |  |
Payment of tender premium on second lien notes |  |  |
Payments of financing costs |  |  |
Net proceeds from the sale of Class A common stock |  |  |
Contributions from noncontrolling interest holders |  |  |
Other |  |  |
Intercompany borrowings |  |  |
Net cash provided by (used in) financing activities |  |  |
Net cash (used in) provided by discontinued operations |  |  |
Net (decrease) increase in cash and cash equivalents |  |  |
Cash and cash equivalents, beginning of period |  |  |
Cash and cash equivalents, end of period |  |  |

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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- Definition Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities. + References No definition available. + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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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