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STOCKHOLDERS' EQUITY (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2023
USD ($)
vote
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
vote
class_of_stock
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2023
shares
Mar. 31, 2023
shares
Jun. 30, 2022
shares
Mar. 31, 2022
shares
Jul. 31, 2021
USD ($)
Aug. 18, 2015
Class of Stock [Line Items]                    
Number of classes of common stock | class_of_stock     2              
Conversion ratio of common stock                   1
Dividends outstanding | $ $ 17,236,000 $ 12,003,000 $ 17,236,000 $ 12,003,000            
Authorized amount to be repurchased | $                 $ 500,000,000  
Stock repurchase program, remaining authorized repurchase amount | $ $ 457,700,000   $ 457,700,000              
Weighted average price per share (in dollars per share) | $ / shares $ 104.36 $ 81.74 $ 104.36 $ 84.72            
Class A Common Stock                    
Class of Stock [Line Items]                    
Common stock voting rights, number of votes | vote 1   1              
Shares issued of common stock (in shares) 51,565,992   51,565,992     50,638,924        
Number of common shares outstanding (in shares) 51,565,992   51,565,992     50,638,924        
Outstanding common stock repurchased and retired (in shares) 239,100,000 100,257,000 239,100,000 577,287,000            
Shares repurchased and retired, value | $ $ 24,952,000 $ 8,195,000 $ 24,952,000 $ 48,905,000            
Class A Common Stock | Common stock                    
Class of Stock [Line Items]                    
Shares issued to non-employee directors (in shares)     6,609 6,739            
Conversion of Class B to Class A shares (in shares) 508,491 231,367 1,159,559 497,859            
Number of common shares outstanding (in shares) 51,565,992 49,780,875 51,565,992 49,780,875 51,296,601 50,638,924 49,649,765 49,853,564    
Class B Common Stock                    
Class of Stock [Line Items]                    
Common stock voting rights, number of votes | vote 10   10              
Shares issued of common stock (in shares) 17,427,625   17,427,625     18,048,345        
Number of common shares outstanding (in shares) 17,427,625   17,427,625     18,048,345        
Outstanding common stock repurchased and retired (in shares) 4,235,000 9,731,000 766,832,000 506,462,000            
Shares repurchased and retired, value | $ $ 259,000 $ 70,000 $ 70,025,000 $ 42,191,000            
Class B Common Stock | Common stock                    
Class of Stock [Line Items]                    
Number of common shares outstanding (in shares) 17,427,625 18,874,122 17,427,625 18,874,122 18,035,565 18,048,345 19,136,952 17,649,555    
Investor | Class A Common Stock                    
Class of Stock [Line Items]                    
Shares issued of common stock (in shares) 51,501,057,000 49,722,549,000 51,501,057,000 49,722,549,000            
HL Holders | Class B Common Stock                    
Class of Stock [Line Items]                    
Number of common shares outstanding (in shares) 17,427,625,000 18,874,122,000 17,427,625,000 18,874,122,000            
Director | Class A Common Stock                    
Class of Stock [Line Items]                    
Shares issued to non-employee directors (in shares) 0 0 6,609 6,739            
Shares issued of common stock (in shares) 64,935,000 58,326,000 64,935,000 58,326,000