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Business Acquisitions (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  | 9 Months Ended | 2 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 Property | Jan. 31, 2012 Property | Jan. 31, 2013 Minimum [Member] Y | Jan. 31, 2012 Minimum [Member] Y | Jan. 31, 2013 Maximum [Member] Y | Jan. 31, 2012 Maximum [Member] Y | Jan. 31, 2013 Business Acquisition [Member] | Jan. 31, 2012 Business Acquisition [Member] | Jan. 31, 2013 Bestway Disposal Services And Bbi Waste Services [Member] | Jan. 31, 2013 Bestway Disposal Services And Bbi Waste Services [Member] Class A Common Stock [Member] | Jan. 31, 2013 BBI Acquisition [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 5,384 | $ 2,284 | $ 5,384 | $ 2,284 |  |  |  |  |  |  | $ 22,650 |  |
Business acquisition, cash | 4,854 | 2,102 | 4,854 | 2,102 |  |  |  |  |  |  | 20,000 |  |
Business acquisition, hold backs to sellers | 180 | 182 | 180 | 182 |  |  |  |  | 530 | 182 |  |  |
Business acquisition, shares |  |  |  |  |  |  |  |  |  |  |  | 625 |
Business acquisition, stock value | 2,650 |  | 2,650 |  |  |  |  |  |  |  | 2,650 |  |
Goodwill not expected to be deductible for tax purpose |  |  |  |  |  |  |  |  |  |  | 8,078 |  |
Number of business acquired |  |  | 4 | 5 |  |  |  |  |  |  |  |  |
Acquired intangible assets, amortization period |  |  |  |  | 5 | 5 | 10 | 10 |  |  |  |  |
Deferred tax liability recorded through goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 5,242
Revenues | $ 115,002 | $ 114,578 | $ 356,531 | $ 371,637 |  |  |  |  |  |  |  |  | $ 2,924

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- Definition Amount of potential cash payments that could result from the contingent consideration arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Emerging Issues Task Force (EITF) -Number 99-12 -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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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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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