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Stockholders' Equity - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Apr. 30, 2013
Apr. 30, 2012
Oct. 31, 2013
Former President And Chief Executive Officer as financial targets for the fiscal year ended April 30, 2010
Oct. 31, 2013
2004 Incentive Stock Plan
Y
Oct. 31, 2013
2013 Incentive Stock Plan
Oct. 31, 2013
Tender Offer
Oct. 31, 2013
Open Market
Oct. 31, 2013
Maximum
Apr. 30, 2013
Maximum
Oct. 31, 2013
Maximum
Tender Offer
Oct. 31, 2013
General and administrative
Oct. 31, 2012
General and administrative
Oct. 31, 2013
RSUs and PSUs
Oct. 31, 2012
RSUs and PSUs
Oct. 31, 2013
Stock Options
Oct. 31, 2013
RSUs
Oct. 31, 2012
RSUs
Oct. 31, 2013
RSUs
Executive Officer
Oct. 31, 2013
RSUs
Director
Oct. 31, 2013
RSUs
Non-Executive Officer
Oct. 31, 2012
PSUs without market-conditions
Oct. 31, 2012
PSUs
Oct. 31, 2013
PSUs
Officer
Oct. 31, 2013
Stock Options
Oct. 31, 2012
Stock Options
Oct. 31, 2013
Stock Options
Oct. 31, 2012
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                          
Stock repurchase authorization                   $ 115,000,000 $ 35,000,000 $ 75,000,000                                  
Repurchasing shares     2,099,603         1,417,233 7,596,895                                        
Repurchase shares value     20,000,000         15,600,000 84,400,000                                        
Stock repurchase remaining authorized amount 15,000,000   15,000,000                                                    
Stock repurchase program, expiration date     Jun. 17, 2014                                                    
Fees and expenses incurred related to tender offer and open market purchases 848,000                                                        
Number of common stock issuable with antidilutive effect                                                   88,839 163,542 124,930 229,639
Number of stock option plans 2                                                        
Authorized of common stock             3,000,000                                            
Period to award vested and calculate volatility rate           3 years                                              
Period of award vested exercisable           10                                              
Option granted   3,500     500,000                                                
Exercise price per share   $ 11.02     $ 1.47                                                
Options outstanding 2,572,661 3,051,660 3,019,127 3,988,164 100,000                                                
Expiration date of options outstanding         Dec. 06, 2014                                                
Intrinsic value of stock outstanding 14,000,000 15,800,000                                                      
Intrinsic value of stock exercisable 11,100,000 9,800,000                                                      
Intrinsic value of stock exercised 3,900,000 5,100,000                                                      
Unrecognized compensation cost of outstanding options 757,000                                                        
Weighted average remaining contractual term                             1 year 3 months 18 days   9 months 11 days                        
ESPP, shares purchased 84,081 92,476                                                      
Stock-based compensation expense                         4,800,000 2,000,000 3,700,000 643,000                          
Stock-based compensation expense related to the loss on sale of our discontinued operations 4,774,000 1,906,000                     45,000 45,000                              
Performance period 3 years                                                        
Percentage of maximum aggregate award granted 200.00%                                                        
Percentage of stock outperform in order for target award to be earned 10.00%                                                        
Stock Units, Awarded                             480,656 90,050   450,656 55,250 250,000 42,238 153,418 34,800   30,000        
Stock Units, Forfeited                             12,518 47,331   12,518 12,331         35,000          
Stock Units, Vested                             210,230 7,667     7,667                    
Market value of Vested shares                             2,400,000       51,000                    
Unrecognized compensation cost related to unvested RSUs and PSUs $ 5,000,000