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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, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | $ 49,642 | $ 43,906 | $ 64,171
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired | (8,305) | (25,225) | (2,102)
Additions to property, plant and equipment | (43,326) | (53,281) | (57,834)
Payments on landfill operating lease contracts | (6,505) | (6,261) | (6,616)
Payment for capital related to divestiture |  | (618) |
Investments in unconsolidated entities | (2,107) | (3,207) | (5,045)
Proceeds from sale of equity method investment | 3,442 |  |
Proceeds from sale of property and equipment | 1,524 | 883 | 1,492
Net cash provided by (used in) investing activities | (57,910) | (89,455) | (70,634)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings | 161,650 | 376,346 | 163,500
Principal payments on long-term debt | (152,380) | (360,858) | (152,806)
Change in restricted cash |  |  |
Payments of financing costs | (405) | (4,609) | (1,592)
Payment of tender premium on second lien notes |  | (10,743) |
Proceeds from the exercise of share based awards | 143 |  | 337
Net proceeds from the issuance of class A common stock |  | 42,184 |
Contributions from noncontrolling interest holder |  | 2,531 | 536
Other |  | (4,513) | 591
Net cash provided by (used in) financing activities | 9,008 | 44,947 | 10,229
Net cash provided by (used in) discontinued operations | (31) | (2,177) | (1,049)
Net increase (decrease) in cash and cash equivalents | 709 | (2,779) | 2,717
Cash and cash equivalents, beginning of period | 1,755 | 4,534 | 1,817
Cash and cash equivalents, end of period | 2,464 | 1,755 | 4,534
Acquisition [Member] |  |  |
Cash Flows from Investing Activities: |  |  |
Additions to property, plant and equipment | (2,633) | (1,746) | (529)
Parent [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | (40,365) | (5,319) | 4,552
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired |  |  |
Additions to property, plant and equipment | (1,675) | (203) | (574)
Payments on landfill operating lease contracts |  |  |
Investments in unconsolidated entities | (2,107) | (4,166) | (2,740)
Proceeds from sale of equity method investment | 3,442 |  |
Proceeds from sale of property and equipment |  |  |
Net cash provided by (used in) investing activities | (340) | (4,369) | (3,314)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings | 161,650 | 334,497 | 163,500
Principal payments on long-term debt | (151,074) | (359,342) | (151,390)
Change in restricted cash |  |  |
Payments of financing costs | (405) |  | (1,592)
Payment of tender premium on second lien notes |  | (10,743) |
Proceeds from the exercise of share based awards |  |  |
Net proceeds from the issuance of class A common stock |  | 42,184 |
Other |  | (4,513) | 591
Intercompany borrowings | 31,425 | 5,066 | (10,079)
Net cash provided by (used in) financing activities | 41,596 | 7,149 | 1,030
Net cash provided by (used in) discontinued operations |  |  |
Net increase (decrease) in cash and cash equivalents | 891 | (2,539) | 2,268
Cash and cash equivalents, beginning of period | 1,260 | 3,799 | 1,531
Cash and cash equivalents, end of period | 2,151 | 1,260 | 3,799
Parent [Member] | Acquisition [Member] |  |  |
Cash Flows from Investing Activities: |  |  |
Additions to property, plant and equipment |  |  |
Guarantors [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | 89,792 | 50,527 | 59,088
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired | (8,305) | (25,225) | (2,102)
Additions to property, plant and equipment | (41,236) | (48,058) | (54,681)
Payments on landfill operating lease contracts | (6,505) | (6,261) | (6,616)
Payment for capital related to divestiture |  | (618) |
Investments in unconsolidated entities |  | (2,707) | (4,184)
Proceeds from sale of equity method investment |  |  |
Proceeds from sale of property and equipment | 1,524 | 883 | 1,492
Net cash provided by (used in) investing activities | (57,155) | (83,732) | (66,620)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings |  | 41,849 |
Principal payments on long-term debt | (1,306) | (1,516) | (1,416)
Change in restricted cash |  |  |
Payments of financing costs |  |  |
Proceeds from the exercise of share based awards | 143 |  |
Intercompany borrowings | (31,425) | (5,066) | 10,079
Net cash provided by (used in) financing activities | (32,588) | 35,267 | 8,663
Net cash provided by (used in) discontinued operations | (31) | (2,177) | (1,049)
Net increase (decrease) in cash and cash equivalents | 18 | (115) | 82
Cash and cash equivalents, beginning of period | 253 | 368 | 286
Cash and cash equivalents, end of period | 271 | 253 | 368
Guarantors [Member] | Acquisition [Member] |  |  |
Cash Flows from Investing Activities: |  |  |
Additions to property, plant and equipment | (2,633) | (1,746) | (529)
Non-Guarantors [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | 215 | (1,302) | 531
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired |  |  |
Additions to property, plant and equipment | (415) | (5,020) | (2,579)
Payments on landfill operating lease contracts |  |  |
Investments in unconsolidated entities |  | 3,666 | 1,879
Proceeds from sale of equity method investment |  |  |
Proceeds from sale of property and equipment |  |  |
Net cash provided by (used in) investing activities | (415) | (1,354) | (700)
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings |  |  |
Principal payments on long-term debt |  |  |
Change in restricted cash |  |  |
Payments of financing costs |  |  |
Proceeds from the exercise of share based awards |  |  |
Contributions from noncontrolling interest holder |  | 2,531 | 536
Intercompany borrowings |  |  |
Net cash provided by (used in) financing activities |  | 2,531 | 536
Net cash provided by (used in) discontinued operations |  |  |
Net increase (decrease) in cash and cash equivalents | (200) | (125) | 367
Cash and cash equivalents, beginning of period | 242 | 367 |
Cash and cash equivalents, end of period | 42 | 242 | 367
Non-Guarantors [Member] | Acquisition [Member] |  |  |
Cash Flows from Investing Activities: |  |  |
Additions to property, plant and equipment |  |  |
Elimination [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities |  |  |
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired |  |  |
Additions to property, plant and equipment |  |  |
Payments on landfill operating lease contracts |  |  |
Investments in unconsolidated entities |  |  |
Proceeds from sale of equity method investment |  |  |
Proceeds from sale of property and equipment |  |  |
Net cash provided by (used in) investing activities |  |  |
Cash Flows from Financing Activities: |  |  |
Proceeds from long-term borrowings |  |  |
Principal payments on long-term debt |  |  |
Change in restricted cash |  |  |
Payments of financing costs |  |  |
Proceeds from the exercise of share based awards |  |  |
Intercompany borrowings |  |  |
Net cash provided by (used in) financing activities |  |  |
Net cash provided by (used in) discontinued operations |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |
Cash and cash equivalents, beginning of period |  |  |
Cash and cash equivalents, end of period |  |  |
Elimination [Member] | Acquisition [Member] |  |  |
Cash Flows from Investing Activities: |  |  |
Additions to property, plant and equipment |  |  |

X
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash inflow associated with the sale of 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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=31042434&loc=d3e3291-108585 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration