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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
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