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Stockholders' Equity (Narrative) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 1 Months Ended |  | 3 Months Ended | 9 Months Ended
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Jan. 31, 2012 | Jan. 31, 2013 Y | Jan. 31, 2013 Altela Inc | Oct. 31, 2012 Altela Inc | Jan. 31, 2013 Employee Stock Purchase Plan [Member] | Jan. 31, 2012 Employee Stock Purchase Plan [Member] | Jan. 31, 2013 Employee Stock Purchase Plan [Member] | Jan. 31, 2012 Employee Stock Purchase Plan [Member] | Jan. 31, 2013 Class A Common Stock [Member] | Oct. 03, 2012 Class A Common Stock [Member] | Jan. 31, 2013 Minimum [Member] | Jan. 31, 2013 Maximum [Member] | Jan. 31, 2013 Restricted Stock And Restricted Stock Unit [Member] Y | Jan. 31, 2013 Performance Stock Units [Member] Y | Jan. 31, 2013 Performance Stock Units [Member] | Jan. 31, 2013 Performance Stock Units [Member] Class A Common Stock [Member] | May 31, 2012 Restricted Stock Units [Member] | Jan. 31, 2013 Restricted Stock Units [Member] Class A Common Stock [Member] | Jan. 31, 2013 Stock Options, Performance Stock Units, Restricted Stock Units And Restricted Stock [Member] | Jan. 31, 2012 Stock Options, Performance Stock Units, Restricted Stock Units And Restricted Stock [Member] | Jan. 31, 2013 Stock Options, Performance Stock Units, Restricted Stock Units And Restricted Stock [Member] | Jan. 31, 2012 Stock Options, Performance Stock Units, Restricted Stock Units And Restricted Stock [Member]
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances of Class A common stock |  |  |  |  |  |  |  |  | 11,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the registered public offering | $ 337 |  |  |  |  |  |  |  | $ 42,184 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock vesting period |  |  |  |  |  |  |  |  |  |  | 1 year | 4 years |  |  |  |  | 3 years |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 529 |  | 264 |  |  |  |
Continued employment service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Performance stock units and restricted stock units grant date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.17 |  |  |  |  |  |
Stock equivalents available for future grant |  |  |  |  |  |  |  |  | 1,320 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options, maximum life |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expenses |  |  |  |  | 22 | 33 | 75 | 85 |  |  |  |  |  |  |  |  |  |  | 232 | (91) | 1,486 | 1,222
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 3,017 | 5,219 | 0 |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  |  |  |  |  |  |  |  |  |  |  | 1.70 | 1.39 | 1.39 |  |  |  |  |  |  |
Membership interest |  |  | 66.10% | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to noncontrolling interest |  |  | $ 258 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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