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STOCKHOLDERS' EQUITY (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2022 shares	Mar. 31, 2022 shares	Jul. 31, 2021 USD ($)	Jun. 30, 2021 shares	Mar. 31, 2021 shares	Aug. 18, 2015
Class of Stock [Line Items]
Conversion ratio of common stock										1
Dividends outstanding | $	$ 12,003,000	$ 6,480,000	$ 12,003,000	$ 6,480,000
Authorized amount to be repurchased | $							$ 500,000,000
Weighted average price per share (in dollars per share) | $ / shares	$ 81.74	$ 82.78	$ 84.72	$ 79.06
Class A Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	49,780,875		49,780,875			49,853,564
Number of common shares outstanding (in shares)	49,780,875		49,780,875			49,853,564
Outstanding common stock repurchased and retired (in shares)	100,257,000	548,896,000	577,287,000	1,428,034,000
Shares repurchased and retired, value | $	$ 8,195,000	$ 45,437,000	$ 48,905,000	$ 112,904,000
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)	231,367	384,632	497,859	1,103,085
Number of common shares outstanding (in shares)	49,780,875	50,927,005	49,780,875	50,927,005	49,649,765	49,853,564		51,091,269	51,245,442
Class B Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	18,874,122		18,874,122			17,649,555
Number of common shares outstanding (in shares)	18,874,122		18,874,122			17,649,555
Outstanding common stock repurchased and retired (in shares)	9,731,000	490,000	506,462,000	455,402,000
Shares repurchased and retired, value | $	$ 70,000	$ 0	$ 42,191,000	$ 33,700,000
Class B Common Stock | Common stock
Class of Stock [Line Items]
Number of common shares outstanding (in shares)	18,874,122	17,348,305	18,874,122	17,348,305	19,136,952	17,649,555		17,745,973	16,951,696
Investor | Class A Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	49,722,549,000	50,872,848,000	49,722,549,000	50,872,848,000
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)	18,874,122,000	17,348,305,000	18,874,122,000	17,348,305,000
Director | Class A Common Stock
Class of Stock [Line Items]
Shares issued of common stock (in shares)	58,326,000	54,157,000	58,326,000	54,157,000

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