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STOCKHOLDERS' EQUITY (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2023
USD ($)
vote
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
class_of_stock
vote
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Sep. 30, 2023
shares
Mar. 31, 2023
shares
Sep. 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 | $ $ 20,110,000 $ 15,322,000 $ 20,110,000 $ 15,322,000            
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   $ 91.68 $ 104.36 $ 85.74            
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) 52,027,676   52,027,676     50,638,924        
Number of common shares outstanding (in shares) 52,027,676   52,027,676     50,638,924        
Outstanding common stock repurchased and retired (in shares)   100,000,000 239,100,000 677,287,000            
Shares repurchased and retired, value | $   $ 9,168,000 $ 24,952,000 $ 58,073,000            
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) 461,684 670,268 1,621,243 1,168,127            
Number of common shares outstanding (in shares) 52,027,676 50,351,143 52,027,676 50,351,143 51,565,992 50,638,924 49,780,875 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) 17,114,509   17,114,509     18,048,345        
Number of common shares outstanding (in shares) 17,114,509   17,114,509     18,048,345        
Outstanding common stock repurchased and retired (in shares) 884,000 1,159,000 767,716,000 507,621,000            
Shares repurchased and retired, value | $ $ 95,000 $ 92,000 $ 70,120,000 $ 42,283,000            
Class B Common Stock | Common stock                    
Class of Stock [Line Items]                    
Number of common shares outstanding (in shares) 17,114,509 18,271,833 17,114,509 18,271,833 17,427,625 18,048,345 18,874,122 17,649,555    
Investor | Class A Common Stock                    
Class of Stock [Line Items]                    
Shares issued of common stock (in shares) 51,962,741,000 50,292,817,000 51,962,741,000 50,292,817,000            
HL Holders | Class B Common Stock                    
Class of Stock [Line Items]                    
Number of common shares outstanding (in shares) 17,114,509,000 18,271,833,000 17,114,509,000 18,271,833,000            
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