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Disclosure Of Compensation Related Costs, Share Based Payments (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended
Oct. 31, 2011
years
Oct. 31, 2010
Jun. 23, 2011
Stock Options [Member]
Oct. 31, 2011
2009 Stock Incentive Plan [Member]
Sep. 16, 2011
Restricted Stock [Member]
Jun. 10, 2011
Restricted Stock [Member]
Jun. 23, 2011
Restricted Stock [Member]
Oct. 31, 2011
Restricted Stock [Member]
Oct. 31, 2011
Plan And Prior Plans [Member]
Oct. 31, 2011
Maximum [Member]
Oct. 31, 2011
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Each award of stock options issued, reduction in shares available amount 1                    
Each award of restricted stock or restricted unit issued, reduction in shares available amount 2                    
Shares available for grant       4,428,604              
Restricted shares granted         14,000 9,198 15,000        
Date vested     June 23, 2014   May 1, 2012 May 1, 2014 June 23, 2014        
Stock granted 441,000   441,000                
Share-based compensation, cost to grantee     $ 0   $ 0 $ 0 $ 0        
Stock options, expiration date                   2021 2012
Aggregate intrinsic value of options outstanding 20,154                    
Weighted average remaining contractual life of options outstanding (years) 7.4                    
Options vested 354,659                    
Weighted average exercise price of options vested $ 22.29                    
Weighted average remaining contractual life of vested options (years) 4.3                    
Aggregate intrinsic value of options vested 9,667                    
Aggregate intrinsic value of options exercised 3,587                    
Total fair value of shares granted 6,461                    
Total compensation costs 1,521 1,057                  
Unrecognized compensation costs               $ 1,435 $ 6,459