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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | $ 19,526 | $ 7,722
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (29) | (3,150)
Additions to property, plant and equipment - acquisitions | (1,072) | (288)
Additions to property, plant and equipment - growth | (1,785) | (2,002)
Additions to property, plant and equipment - maintenance | (11,622) | (14,179)
Payments on landfill operating lease contracts | (1,982) | (1,814)
Payment for capital related to divestiture |  | (618)
Investments in unconsolidated entities | (2,148) | (1,000)
Proceeds from sale of property and equipment | 284 | 265
Net cash provided by (used in) investing activities | (18,354) | (22,786)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 29,890 | 62,310
Principal payments on long-term debt | (29,310) | (48,689)
Payments of financing costs | (359) | (96)
Excess tax benefit on the vesting of share based awards | (63) | 205
Contributions from noncontrolling interest holders |  | 721
Net cash provided by (used in) financing activities | 158 | 14,451
Net cash provided by (used in) discontinued operations | (166) | (416)
Net increase (decrease) in cash and cash equivalents | 1,164 | (1,029)
Cash and cash equivalents, beginning of period | 1,755 | 4,534
Cash and cash equivalents, end of period | 2,919 | 3,505
Parent [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | (6,951) | (5,192)
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment - maintenance | (237) | (105)
Investments in unconsolidated entities | (2,148) | (1,000)
Net cash provided by (used in) investing activities | (2,385) | (1,105)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 29,890 | 62,310
Principal payments on long-term debt | (28,585) | (47,944)
Payments of financing costs | (359) | (96)
Excess tax benefit on the vesting of share based awards | (63) | 205
Intercompany borrowings | 9,513 | (9,554)
Net cash provided by (used in) financing activities | 10,396 | 4,921
Net increase (decrease) in cash and cash equivalents | 1,060 | (1,376)
Cash and cash equivalents, beginning of period | 1,260 | 3,799
Cash and cash equivalents, end of period | 2,320 | 2,423
Guarantors [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | 26,358 | 13,231
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (29) | (3,150)
Additions to property, plant and equipment - acquisitions | (1,072) | (288)
Additions to property, plant and equipment - growth | (1,724) | (1,232)
Additions to property, plant and equipment - maintenance | (11,385) | (14,074)
Payments on landfill operating lease contracts | (1,982) | (1,814)
Payment for capital related to divestiture |  | (618)
Investments in unconsolidated entities |  | (750)
Proceeds from sale of property and equipment | 284 | 265
Net cash provided by (used in) investing activities | (15,908) | (21,661)
Cash Flows from Financing Activities: |  |
Principal payments on long-term debt | (725) | (745)
Intercompany borrowings | (9,513) | 9,554
Net cash provided by (used in) financing activities | (10,238) | 8,809
Net cash provided by (used in) discontinued operations | (166) | (416)
Net increase (decrease) in cash and cash equivalents | 46 | (37)
Cash and cash equivalents, beginning of period | 253 | 368
Cash and cash equivalents, end of period | 299 | 331
Non-Guarantors [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | 119 | (317)
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment - growth | (61) | (770)
Investments in unconsolidated entities |  | 750
Net cash provided by (used in) investing activities | (61) | (20)
Cash Flows from Financing Activities: |  |
Contributions from noncontrolling interest holders |  | 721
Net cash provided by (used in) financing activities |  | 721
Net increase (decrease) in cash and cash equivalents | 58 | 384
Cash and cash equivalents, beginning of period | 242 | 367
Cash and cash equivalents, end of period | 300 | 751
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 - 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 |  |
Investments in unconsolidated entities |  |
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 |  |
Payments of financing costs |  |
Excess tax benefit on the vesting of share based awards |  |
Contributions from noncontrolling interest holders |  |
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 |  |

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 Increase (decrease) in cash associated with the entity's discontinued operations. + 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 + Details
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- Definition Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + 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) 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 outflow for loan and debt issuance costs. + 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 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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