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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, 2014 | Jul. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | $ 13,581 | $ 19,526
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  | (29)
Additions to property, plant and equipment | (16,881) | (13,407)
Payments on landfill operating lease contracts | (962) | (1,982)
Payments related to investments |  | (2,148)
Proceeds from sale of property and equipment | 163 | 284
Net cash provided by (used in) investing activities | (17,725) | (18,354)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 38,300 | 29,890
Principal payments on long-term debt | (34,314) | (29,310)
Payments of financing costs | (1) | (359)
Proceeds from the exercise of share based awards | 143 |
Excess tax benefit on the vesting of share based awards | 59 | (63)
Intercompany borrowings |  |
Net cash provided by (used in) financing activities | 4,187 | 158
Net cash provided by (used in) discontinued operations | 88 | (166)
Net increase (decrease) in cash and cash equivalents | 131 | 1,164
Cash and cash equivalents, beginning of period | 2,464 | 1,755
Cash and cash equivalents, end of period | 2,595 | 2,919
Parent [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | (9,238) | (6,951)
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  |
Additions to property, plant and equipment | (227) | (237)
Payments on landfill operating lease contracts |  |
Payments related to investments |  | (2,148)
Proceeds from sale of property and equipment |  |
Net cash provided by (used in) investing activities | (227) | (2,385)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings |  | 29,890
Principal payments on long-term debt | (34,181) | (28,585)
Payments of financing costs | (1) | (359)
Proceeds from the exercise of share based awards |  |
Excess tax benefit on the vesting of share based awards | 59 | (63)
Intercompany borrowings | 43,429 | 9,513
Net cash provided by (used in) financing activities | 9,306 | 10,396
Net cash provided by (used in) discontinued operations |  |
Net increase (decrease) in cash and cash equivalents | (159) | 1,060
Cash and cash equivalents, beginning of period | 2,151 | 1,260
Cash and cash equivalents, end of period | 1,992 | 2,320
Guarantor [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | 22,829 | 26,358
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  | (29)
Additions to property, plant and equipment | (16,654) | (13,109)
Payments on landfill operating lease contracts | (962) | (1,982)
Payments related to investments | (310) |
Proceeds from sale of property and equipment | 163 | 284
Net cash provided by (used in) investing activities | (17,808) | (15,908)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 38,300 |
Principal payments on long-term debt | (133) | (725)
Payments of financing costs |  |
Proceeds from the exercise of share based awards | 143 |
Excess tax benefit on the vesting of share based awards |  |
Intercompany borrowings | (43,429) | (9,513)
Net cash provided by (used in) financing activities | (5,119) | (10,238)
Net cash provided by (used in) discontinued operations | 88 | (166)
Net increase (decrease) in cash and cash equivalents | (10) | 46
Cash and cash equivalents, beginning of period | 271 | 253
Cash and cash equivalents, end of period | 261 | 299
Non-Guarantor [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | (10) | 119
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  |
Additions to property, plant and equipment |  | (61)
Payments on landfill operating lease contracts |  |
Payments related to investments | 310 |
Proceeds from sale of property and equipment |  |
Net cash provided by (used in) investing activities | 310 | (61)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings |  |
Principal payments on long-term debt |  |
Payments of financing costs |  |
Proceeds from the exercise of share based awards |  |
Excess tax benefit on the vesting 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 | 300 | 58
Cash and cash equivalents, beginning of period | 42 | 242
Cash and cash equivalents, end of period | 342 | 300
Acquisition [Member] |  |
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment | (45) | (1,072)
Acquisition [Member] | Parent [Member] |  |
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment |  |
Acquisition [Member] | Guarantor [Member] |  |
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment | (45) | (1,072)
Acquisition [Member] | Non-Guarantor [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 |  |
Payments related to investments |  |
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 |  |
Proceeds from the exercise of share based awards |  |
Excess tax benefit on the vesting 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 |  |

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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + 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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