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EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS’ EQUITY: Narrative (Details) - USD ($)
shares in Millions
 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Acquisition of treasury stock $ 44,077,000 $ 42,312,000  
Treasury stock, at cost 2,083,137,000   $ 2,026,518,000
Accumulated other comprehensive income (loss), foreign currency translation adjustment 6,000,000   $ 7,500,000
Common Stock Repurchase Program      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock repurchase program, authorized amount $ 1,000,000,000    
Acquisition of treasury stock (in shares) 1.0    
Acquisition of treasury stock $ 44,100,000    
Treasury stock, at cost (in shares) 29.2    
Treasury stock, at cost $ 717,600,000    
Stock repurchase program, remaining amount $ 282,400,000