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STOCKHOLDERS' EQUITY (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Sep. 30, 2022 shares	Mar. 31, 2022 shares	Sep. 30, 2021 shares	Jul. 31, 2021 USD ($)	Mar. 31, 2021 shares	Aug. 18, 2015
Class of Stock [Line Items]
Conversion ratio of common stock										1
Dividends outstanding | $	$ 15,322,000	$ 7,894,000	$ 15,322,000	$ 7,894,000
Authorized amount to be repurchased | $								$ 500,000,000
Stock repurchase program, remaining authorized repurchase amount | $	$ 482,700,000		$ 482,700,000
Weighted average price per share (in dollars per share) | $ / shares	$ 91.68	$ 108.90	$ 85.74	$ 88.35
Class A Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	50,351,143		50,351,143			49,853,564
Number of common shares outstanding (in shares)	50,351,143		50,351,143			49,853,564
Outstanding common stock repurchased and retired (in shares)	100,000,000	644,900,000	677,287,000	2,072,934,000
Shares repurchased and retired, value | $	$ 9,168,000	$ 70,232,000	$ 58,073,000	$ 183,136,000
Class A Common Stock | Common stock
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)			6,739	6,512
Conversion of Class B to Class A shares (in shares)	670,268	642,693	1,168,127	1,745,778
Number of common shares outstanding (in shares)	50,351,143	50,924,798	50,351,143	50,924,798	49,780,875	49,853,564	50,927,005		51,245,442
Class B Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	18,271,833		18,271,833			17,649,555
Number of common shares outstanding (in shares)	18,271,833		18,271,833			17,649,555
Outstanding common stock repurchased and retired (in shares)	1,159,000	0	507,621,000	455,402,000
Shares repurchased and retired, value | $	$ 92,000		$ 42,283,000	$ 33,700,000
Class B Common Stock | Common stock
Class of Stock [Line Items]
Number of common shares outstanding (in shares)	18,271,833	16,727,176	18,271,833	16,727,176	18,874,122	17,649,555	17,348,305		16,951,696
Investor | Class A Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	50,292,817,000	50,870,525,000	50,292,817,000	50,870,525,000
Director | Class A Common Stock
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)	0	0	6,739	6,512
HL Holders | Class B Common Stock
Class of Stock [Line Items]
Number of common shares outstanding (in shares)	18,271,833,000	16,727,176,000	18,271,833,000	16,727,176,000
Director | Class A Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	58,326,000	54,273,000	58,326,000	54,273,000

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