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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Apr. 30, 2013
Components of Intangible Assets | Intangible assets at April 30, 2013 and 2012 consist of the following:
|  | Covenants Not to Compete |  |  | Client Lists |  |  | Total |
Balance, April 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ | 17,043 |  |  | $ | 11,660 |  |  | $ | 28,703 |
Less accumulated amortization |  |  | (14,800) |  |  |  | (2,229) |  |  |  | (17,029) |
|  | $ | 2,243 |  |  | $ | 9,431 |  |  | $ | 11,674 |
Balance, April 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ | 15,601 |  |  | $ | 3,093 |  |  | $ | 18,694 |
Less accumulated amortization |  |  | (14,324) |  |  |  | (1,400) |  |  |  | (15,724) |
|  | $ | 1,277 |  |  | $ | 1,693 |  |  | $ | 2,970 |
Estimated of Amortization Expenses | The intangible amortization expense estimated as of April 30, 2013 for the five fiscal years following fiscal year 2013 and thereafter is as follows:
2014 |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |  |  | Thereafter |
$ 2,216 |  | $ | 1,907 |  |  | $ | 1,525 |  |  | $ | 1,262 |  |  | $ | 1,309 |  |  | $ | 3,455 |
Schedule of Activity and Balances Related to Goodwill | The following table shows the activity and balances related to goodwill from April 30, 2011 through April 30, 2013:
|  | April 30, 2012 |  |  | Acquisitions |  |  | Other (1) |  |  | April 30, 2013 |
Eastern region |  | $ | 58 |  |  | $ | 12,939 |  |  | $ | 3,861 |  |  | $ | 16,858 |
Western region |  |  | 89,458 |  |  |  | 1,283 |  |  |  | (3,861 | ) |  |  | 86,880 |
Recycling |  |  | 12,190 |  |  |  | - |  |  |  | - |  |  |  | 12,190 |
Total |  | $ | 101,706 |  |  | $ | 14,222 |  |  |  | - |  |  | $ | 115,928 |
(1) | Goodwill movement between the Eastern and Western regions is associated with the movement of certain operations between the reporting units during fiscal year 2013.
|  | April 30, 2011 |  |  | Acquisitions |  |  | April 30, 2012 |
Eastern region |  | $ | 38 |  |  | $ | 20 |  |  | $ | 58 |
Western region |  |  | 88,976 |  |  |  | 482 |  |  |  | 89,458 |
Recycling |  |  | 12,190 |  |  |  | - |  |  |  | 12,190 |
Total |  | $ | 101,204 |  |  | $ | 502 |  |  | $ | 101,706 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -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 Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -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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