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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Jan. 31, 2013
Schedule of Activity and Balances Related to Goodwill | The following table shows the activity and balances related to goodwill from April 30, 2012 through January 31, 2013:
|  | April 30, 2012 |  |  | Acquisitions |  |  | January 31, 2013 |
Eastern region |  | $ | 58 |  |  | $ | 13,339 |  |  | $ | 13,397 |
Western region |  |  | 89,458 |  |  |  | 1,236 |  |  | $ | 90,694 |
Recycling |  |  | 12,190 |  |  |  | — |  |  | $ | 12,190 |
Total |  | $ | 101,706 |  |  | $ | 14,575 |  |  | $ | 116,281 |
Components of Intangible Assets | Intangible assets as of January 31, 2013 and April 30, 2012 consist of the following:
|  | Covenants Not to Compete |  |  | Client Lists |  |  | Total |
Balance, January 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ | 17,022 |  |  | $ | 11,432 |  |  | $ | 28,454 |
Less accumulated amortization |  |  | (14,661 | ) |  |  | (1,814 | ) |  |  | (16,475 | )
|  | $ | 2,361 |  |  | $ | 9,618 |  |  | $ | 11,979 |
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 | Intangible amortization expense for the three and nine months ended January 31, 2013 and 2012 was $353, $156, $751 and $460, respectively. The intangible amortization expense estimated for the five fiscal years following fiscal year 2012 and thereafter is as follows:
2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | Thereafter
$ 1,829 |  | $ 1,660 |  | $ 1,610 |  | $ 1,429 |  | $ 1,325 |  | $ 4,877

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- Definition Tabular disclosure of the estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years. + 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 + Details
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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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