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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income, Net [Member]
Beginning Balance, Shares at Apr. 30, 2009   44,729    
Beginning Balance at Apr. 30, 2009 $ 459,637 $ 368,430 $ 84,922 $ 6,285
Comprehensive income:        
Net income 5,298   5,298  
Other comprehensive income, net of tax:        
Foreign currency translation adjustments 15,377     15,377
Defined benefit pension plan (8,728)     (8,728)
Total comprehensive income 11,947      
Purchase of stock, shares   (226)    
Purchase of stock (3,136) (3,136)    
Issuance of stock (in shares)   1,476    
Issuance of stock 6,526 6,526    
Stock-based compensation 17,508 17,508    
Tax benefit (expense) from exercise of stock options (611) (611)    
Ending Balance, Shares at Apr. 30, 2010   45,979    
Ending Balance at Apr. 30, 2010 491,871 388,717 90,220 12,934
Comprehensive income:        
Net income 58,874   58,874  
Other comprehensive income, net of tax:        
Foreign currency translation adjustments 16,739     16,739
Defined benefit pension plan (4,048)     (4,048)
Unrealized gains on marketable securities 35     35
Total comprehensive income 71,600      
Exercise of warrants, Shares   274    
Exercise of warrants 2,983 2,983    
Purchase of stock, shares   (934)    
Purchase of stock (13,844) (13,844)    
Issuance of stock (in shares)   1,684    
Issuance of stock 10,084 10,084    
Stock-based compensation 15,476 15,476    
Tax benefit (expense) from exercise of stock options 1,287 1,287    
Payment of dividends by majority owned consolidated subsidiaries (600)   (600)  
Ending Balance, Shares at Apr. 30, 2011   47,003    
Ending Balance at Apr. 30, 2011 578,857 404,703 148,494 25,660
Comprehensive income:        
Net income 54,303   54,303  
Other comprehensive income, net of tax:        
Foreign currency translation adjustments (12,826)     (12,826)
Defined benefit pension plan (5,644)     (5,644)
Unrealized gains on marketable securities 1     1
Total comprehensive income 35,834      
Purchase of stock, shares   (190)    
Purchase of stock (4,215) (4,215)    
Issuance of stock (in shares)   1,100    
Issuance of stock 4,371 4,371    
Stock-based compensation 13,475 13,475    
Tax benefit (expense) from exercise of stock options 1,664 1,664    
Ending Balance, Shares at Apr. 30, 2012   47,913    
Ending Balance at Apr. 30, 2012 $ 629,986 $ 419,998 $ 202,797 $ 7,191