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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive (Loss) Income, Net
Beginning Balance, Shares at Apr. 30, 2011   47,003,000    
Beginning Balance at Apr. 30, 2011 $ 578,857 $ 404,703 $ 148,494 $ 25,660
Comprehensive income 35,834   54,303 (18,469)
Purchase of stock, shares   (190,000)    
Purchase of stock (4,215) (4,215)    
Issuance of stock (in shares)   1,100,000    
Issuance of stock 4,371 4,371    
Stock-based compensation 13,475 13,475    
Tax benefit from exercise of stock options 1,664 1,664    
Ending Balance, Shares at Apr. 30, 2012   47,913,000    
Ending Balance at Apr. 30, 2012 629,986 419,998 202,797 7,191
Comprehensive income 23,471   33,293 (9,822)
Purchase of stock, shares   (197,000)    
Purchase of stock (2,838) (2,838)    
Issuance of stock (in shares)   1,018,000    
Issuance of stock 2,134 2,134    
Stock-based compensation 11,920 11,920    
Tax benefit from exercise of stock options 294 294    
Ending Balance, Shares at Apr. 30, 2013 48,734,000 48,734,000    
Ending Balance at Apr. 30, 2013 664,967 431,508 236,090 (2,631)
Comprehensive income 72,934   72,691 243
Purchase of stock, shares   (113,000)    
Purchase of stock (2,249) (2,249)    
Issuance of stock (in shares)   1,190,000    
Issuance of stock 8,805 8,805    
Stock-based compensation 12,160 12,160    
Tax benefit from exercise of stock options (593) (593)    
Ending Balance, Shares at Apr. 30, 2014 49,811,000 49,811,000    
Ending Balance at Apr. 30, 2014 $ 756,024 $ 449,631 $ 308,781 $ (2,388)