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Treasury Stock and Repurchase Program - Components of treasury stock, at cost (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Shares          
Balance as of April 30, 2013     123,572 [1],[2],[3] 123,572 [1],[2],[3]  
Purchases effected in open market 15,922 13,428 25,723    
Balance as of January 31, 2014 178,645     178,645  
Total Average Cost Assigned          
Balance as of April 30, 2013     $ 1,572 [1],[2],[3] $ 1,572 [1],[2],[3]  
Purchases effected in open market 160 123 226 509 147
Balance as of January 31, 2014 2,081     2,081  
Average Cost per Share          
Balance as of April 30, 2013     $ 12.72 [1],[2],[3] $ 12.72 [1],[2],[3]  
Purchases effected in open market $ 10.02 $ 9.13 $ 8.82    
Balance as of January 31, 2014 $ 11.65     $ 11.65  
Aggregate Purchase Price Remaining Under the Program          
Balance as of April 30, 2013     2,818 [1],[2],[3] 2,818 [1],[2],[3]  
Purchases effected in open market $ 2,309 $ 2,469 $ 2,592    
[1] Includes 18,400 shares with a total average cost of $354,000 that were acquired prior to the repurchase program authorized in January 2011.
[2] Includes 85,219 shares with a total average cost of $1,036,000 that were acquired during the former repurchase program, which was authorized in January 2011 and expired in January 2012.
[3] Includes 19,953 shares with a total average cost of $182,000 that were acquired during the current repurchase program authorized in September 2012.