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STOCKHOLDERS' EQUITY: - Narrative (Details) - USD ($)
 12 Months Ended 91 Months Ended
Oct. 25, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Oct. 24, 2019
Authorized shares and par value disclosure            
Common stock, authorized shares   200,000,000 200,000,000   200,000,000  
Common stock, par value (in dollars per share)   $ 0.10 $ 0.1   $ 0.10  
Preferred stock, authorized shares   1,000,000     1,000,000  
Preferred stock, par value (in dollars per share)   $ 1.00     $ 1.00  
Stockholders' Equity            
Number of shares repurchased         22,600,000  
Repurchase of treasury stock   $ 74,421,000 $ 88,884,000 $ 30,542,000 $ 449,100,000  
Remaining capacity under the stock repurchase program   $ 550,900,000     $ 550,900,000  
Treasury stock, shares   73,200,000 58,300,000   73,200,000  
Acquisition of treasury stock from tender offer   $ 503,393,000 $ 0 $ 0    
Shares which remained available for future grants (in shares)   12,100,000     12,100,000  
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares)   42,300,000     42,300,000  
Amended Common Stock Repurchase Plan            
Stockholders' Equity            
Maximum amount of common stock that may be repurchased $ 1,000,000,000.0         $ 500,000,000
Number of shares repurchased   2,400,000 3,300,000      
Repurchase of treasury stock   $ 74,400,000 $ 88,900,000      
Common Stock Repurchase Plan            
Stockholders' Equity            
Number of shares repurchased       1,300,000    
Repurchase of treasury stock       $ 30,500,000    
Dutch Auction Tender Offer            
Stockholders' Equity            
Maximum amount of common stock that may be repurchased $ 500,000,000          
Repurchase of common stock, percentage 2.00% 14.20%        
Treasury stock, shares 11,200,000          
Treasury stock acquired, average cost per share (in dollars per share) $ 44.50          
Acquisition of treasury stock from tender offer $ 503,400,000          
Amended And Restated 2005 Equity Compensation Plan            
Stockholders' Equity            
Shares which remained available for future grants (in shares)   37,900,000 32,900,000   37,900,000  
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares)   34,500,000     34,500,000