STOCK-BASED COMPENSATION - Annual Awards (Details) - Stock Incentive Plan 2015 - $ / shares	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
RSUs
Number of Shares
Nonvested at the beginning of the period (in shares)	89,291	97,867	113,086
Granted (in shares)	39,298	51,955	52,256
Vested (in shares)	(44,148)	(45,092)	(60,034)
Forfeited (in shares)	(6,644)	(15,439)	(7,441)
Nonvested at the end of the period (in shares)	77,797	89,291	97,867
Weighted- Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 330.57	$ 284.00	$ 179.58
Granted (in dollars per share)	573.25	338.99	363.89
Vested (in dollars per share)	(313.11)	(249.67)	(162.37)
Forfeited (in dollars per share)	(462.41)	(299.96)	(239.39)
Outstanding at the end of the period (in dollars per share)	$ 451.81	$ 330.57	$ 284.00
LTIP PSUs
Number of Shares
Nonvested at the beginning of the period (in shares)	111,204	103,032	116,128
Granted (in shares)	46,282	65,470	69,644
Vested (in shares)	(50,228)	(30,104)	(69,816)
Forfeited (in shares)	(18,734)	(27,194)	(12,924)
Nonvested at the end of the period (in shares)	88,524	111,204	103,032
Weighted- Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 347.86	$ 344.25	$ 215.30
Granted (in dollars per share)	570.81	330.70	358.75
Vested (in dollars per share)	(368.33)	(319.81)	(131.33)
Forfeited (in dollars per share)	(522.88)	(323.92)	(239.81)
Outstanding at the end of the period (in dollars per share)	$ 415.77	$ 347.86	$ 344.25