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Investments (Tables)
 12 Months Ended
Apr. 30, 2014
Investments  
Schedule of investments
  April 30,  
 
   2014   2013  
 
   (In thousands)
  

Short-term investments:

              

Held-to-maturity securities:

              

Municipal securities

   $ 69,898   $ 73,241  

Certificates of deposit

     741     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ 70,639   $ 73,241  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

Long-term investments:

              

Held-to-maturity securities:

              

Municipal securities

   $ 29,759   $ 54,158  

Certificates of deposit

     3,889     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Total held-to-maturity investments

     33,648     54,158  

Available-for-sale securities:

              

Auction rate securities

     5,683     5,687  

Convertible bonds

     5,865     9,071  

Equity securities

     5,309     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Total available-for-sale investments

     16,857     14,758  
           
​ ​ ​ ​ ​ ​ ​ ​

Total long-term investments

   $ 50,505   $ 68,916  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of amortized cost, gross unrealized losses, and estimated fair value of held-to-maturity investments

The amortized cost, gross unrealized losses, and estimated fair value of the held-to-maturity investments as of April 30, are as follows (in thousands):

 
   2014   2013  
 
   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

Municipal securities

   $ 99,657   $ 65   $ (9 ) $ 99,713   $ 127,399   $ 49   $ (23 ) $ 127,425  

Certificates of deposit

     4,630     —     —     4,630     —     —     —     —  
                                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total held-to-maturity investments

   $ 104,287   $ 65   $ (9 ) $ 104,343   $ 127,399   $ 49   $ (23 ) $ 127,425  
                                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                   
Held-to-maturity securities
  
Investments  
Schedule of amortized cost and fair value by contractual maturity

   The amortized cost and fair value of the Company's held-to-maturity securities by contractual maturity at April 30, 2014, are as follows:

 
   Cost   Fair Value  

Due within one year

   $ 70,639   $ 70,671  

Due after one year through five years

     33,648     33,672  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 104,287   $ 104,343  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Available-for-sale securities | Auction rate securities
  
Investments  
Schedule of amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of available-for-sale investments

The amortized cost, gross unrealized losses, and estimated fair value of the available-for-sale auction rate securities are as follows (in thousands):

 
   April 30,  
 
   2014   2013  

Auction rate securities

              

Amortized cost

   $ 6,575   $ 6,750  

Gross unrealized losses

     (892 )   (1,063 )
           
​ ​ ​ ​ ​ ​ ​ ​

Fair value

   $ 5,683   $ 5,687  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of amortized cost and fair value by contractual maturity

The amortized cost and fair value of the Company's auction rate securities by contractual maturity at April 30, 2014 are as follows (in thousands):

 
   Cost   Fair Value  

Due after five through 10 years

   $ 1,300   $ 1,209  

Due after 10 years

     5,275     4,474  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 6,575   $ 5,683  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Available-for-sale securities | Convertible bonds
  
Investments  
Schedule of amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of available-for-sale investments

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the available-for-sale convertible bonds are as follows (in thousands):

 
   April 30,  
 
   2014   2013  

Convertible bonds

              

Amortized cost

   $ 1,519   $ 3,037  

Gross unrealized gains

     4,346     6,173  

Gross unrealized losses

     —     (139 )
           
​ ​ ​ ​ ​ ​ ​ ​

Fair value

   $ 5,865   $ 9,071  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of amortized cost and fair value by contractual maturity

The amortized cost and fair value of the Company's convertible bond by contractual maturity at April 30, 2014 are as follows (in thousands):

 
   Cost   Fair Value  

Due within five years

   $ 1,519   $ 5,865  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 1,519   $ 5,865  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​