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Subsidiary Guarantors (Schedule of Condensed Consolidating Statements of Cash Flows) (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | $ 30,526 | $ 49,742
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (25,106) | (2,102)
Additions to property, plant and equipment - acquisitions | (528) | (168)
Additions to property, plant and equipment - growth | (10,415) | (9,833)
Additions to property, plant and equipment- maintenance | (33,526) | (39,279)
Payment for capital related to divestiture | (618) |
Payments on landfill operating lease contracts | (5,726) | (6,052)
Proceeds from sale of property and equipment | 795 | 1,337
Investments in unconsolidated entities | (1,000) | (4,146)
Net cash provided by (used in) investing activities | (76,124) | (60,243)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 334,497 | 127,900
Principal payments on long-term debt | (320,483) | (119,433)
Payment of tender premium on second lien notes | (10,743) |
Net proceeds from the issuance of class A common stock | 42,184 |
Contributions from noncontrolling interest holder | 1,195 | 174
Other | (4,474) | 623
Net cash provided by (used in) financing activities | 42,176 | 9,090
Cash provided by discontinued operations |  | 725
Net increase (decrease) in cash and cash equivalents | (3,422) | (686)
Cash and cash equivalents, beginning of period | 4,534 | 1,817
Cash and cash equivalents, end of period | 1,112 | 1,131
Parent [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (3,983) | 5,176
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 | (233) | (977)
Payment for capital related to divestiture |  |
Payments on landfill operating lease contracts |  |
Proceeds from sale of property and equipment |  |
Investments in unconsolidated entities | (4,736) | (1,820)
Net cash provided by (used in) investing activities | (4,969) | (2,797)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 334,497 | 127,900
Principal payments on long-term debt | (319,365) | (118,356)
Payment of tender premium on second lien notes | (10,743) |
Net proceeds from the issuance of class A common stock | 42,184 |
Contributions from noncontrolling interest holder |  |
Other | (4,474) | 449
Intercompany borrowings | (36,126) | (12,961)
Net cash provided by (used in) financing activities | 5,973 | (2,968)
Net increase (decrease) in cash and cash equivalents | (2,979) | (589)
Cash and cash equivalents, beginning of period | 3,799 | 1,531
Cash and cash equivalents, end of period | 820 | 942
Guarantors [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | 35,357 | 44,524
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (25,106) | (2,102)
Additions to property, plant and equipment - acquisitions | (528) | (168)
Additions to property, plant and equipment - growth | (5,530) | (8,209)
Additions to property, plant and equipment- maintenance | (33,293) | (38,302)
Payment for capital related to divestiture | (618) |
Payments on landfill operating lease contracts | (5,726) | (6,052)
Proceeds from sale of property and equipment | 795 | 1,337
Investments in unconsolidated entities | (500) | (3,785)
Net cash provided by (used in) investing activities | (70,506) | (57,281)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings |  |
Principal payments on long-term debt | (1,118) | (1,077)
Payment of tender premium on second lien notes |  |
Net proceeds from the issuance of class A common stock |  |
Contributions from noncontrolling interest holder |  |
Other |  |
Intercompany borrowings | 36,126 | 12,961
Net cash provided by (used in) financing activities | 35,008 | 11,884
Cash provided by discontinued operations |  | 725
Net increase (decrease) in cash and cash equivalents | (141) | (148)
Cash and cash equivalents, beginning of period | 368 | 286
Cash and cash equivalents, end of period | 227 | 138
Non-Guarantors [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (848) | 42
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  |
Additions to property, plant and equipment - acquisitions |  |
Additions to property, plant and equipment - growth | (4,885) | (1,624)
Additions to property, plant and equipment- maintenance |  |
Payment for capital related to divestiture |  |
Payments on landfill operating lease contracts |  |
Proceeds from sale of property and equipment |  |
Investments in unconsolidated entities | 4,236 | 1,459
Net cash provided by (used in) investing activities | (649) | (165)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings |  |
Principal payments on long-term debt |  |
Payment of tender premium on second lien notes |  |
Net proceeds from the issuance of class A common stock |  |
Contributions from noncontrolling interest holder | 1,195 | 174
Other |  |
Intercompany borrowings |  |
Net cash provided by (used in) financing activities | 1,195 | 174
Net increase (decrease) in cash and cash equivalents | (302) | 51
Cash and cash equivalents, beginning of period | 367 |
Cash and cash equivalents, end of period | 65 | 51
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 |  |
Payment for capital related to divestiture |  |
Payments on landfill operating lease contracts |  |
Proceeds from sale of property and equipment |  |
Investments in unconsolidated entities |  |
Net cash provided by (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 |  |
Net proceeds from the issuance of class A common stock |  |
Contributions from noncontrolling interest holder |  |
Other |  |
Intercompany borrowings |  |
Net cash provided by (used in) financing activities |  |
Net increase (decrease) 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 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 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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