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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2013 Stock Options [Member] | Apr. 30, 2012 Stock Options [Member] | Apr. 30, 2011 Stock Options [Member] | Apr. 30, 2013 Employee Stock Purchase Plan [Member] | Apr. 30, 2012 Employee Stock Purchase Plan [Member] | Apr. 30, 2011 Employee Stock Purchase Plan [Member] | Apr. 30, 2013 Restricted Stock Restricted Stock Units and Performance Stock Units [Member] | Apr. 30, 2012 Restricted Stock Restricted Stock Units and Performance Stock Units [Member] | Apr. 30, 2011 Restricted Stock Restricted Stock Units and Performance Stock Units [Member] | Apr. 30, 2013 Restricted Stock And Restricted Stock Unit [Member] Y | Apr. 30, 2013 Performance Stock Units [Member] Y | Apr. 30, 2013 Performance Stock Units [Member] | Apr. 30, 2013 1997 Non-Employee Director Stock Option Plan [Member] | Apr. 30, 2013 Casella-Altela Regional Environmental Services LLC [Member] Altela, Inc. [Member] | Apr. 30, 2013 Maximum [Member] Altela, Inc. [Member] | Apr. 30, 2013 Minimum [Member] Altela, Inc. [Member] | Oct. 31, 2012 Class A Common Stock [Member] | Apr. 30, 2013 Class A Common Stock [Member] | Apr. 30, 2011 Class A Common Stock [Member] | Apr. 30, 2013 Class A Common Stock [Member] 1997 Stock Option Plan [Member] | Apr. 30, 2012 Class A Common Stock [Member] 1997 Stock Option Plan [Member] | Apr. 30, 2013 Class A Common Stock [Member] 1997 Non-Employee Director Stock Option Plan [Member] | Apr. 30, 2012 Class A Common Stock [Member] 1997 Non-Employee Director Stock Option Plan [Member] | Apr. 30, 2013 Class A Common Stock [Member] 2006 Stock Incentive Plan [Member] | Apr. 30, 2012 Class A Common Stock [Member] 2006 Stock Incentive Plan [Member] | Apr. 30, 2013 Class A Common Stock [Member] Maximum [Member] 1997 Non-Employee Director Stock Option Plan [Member] | Apr. 30, 2013 Preferred Stock [Member] | Apr. 30, 2012 Preferred Stock [Member] | Apr. 30, 2013 Preferred Stock [Member] Maximum [Member]
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances of Class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,500,000 | 11,500,000 |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the registered public offering |  | $ 337 | $ 476 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,184 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized to issue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 944,000
Shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Options to purchase | 1,442 | 1,661 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 599 | 1,081 | 75 | 95 | 768 | 485 |  |  |  |
Weighted average exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.23 | $ 11.82 | $ 12.45 | $ 11.04 | $ 5.16 | $ 7.64 |  |  |  |
Common stock, issued shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,475 |  | 200,000 |  |  |
Non-Employee Director Plan termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | July 31, 2007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,602 |  |  |  |  |
Stock-based compensation expense | 2,236 | 1,855 | 1,592 | 528 | 258 | 387 | 99 | 113 | 122 | 1,609 | 1,485 | 1,083 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes associated with stock-based compensation expense | 0 | 0 | 97 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 259,000 |  |  |  |  |  |  |  |  |  |
Recognition of total compensation expense |  |  | 1,438 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,750 | 3,805 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  |  |  |  |  |  |  |  |  |  |  | 1.64 | 1.64 | 1.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits from additional paid in capital adjustments | $ 96 | $ 254 | $ 129 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% | 66.10% | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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