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NET INCOME PER SHARE ATTRIBUTABLE TO COMMON SHAREHOLDERS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 312,771	$ 183,793	$ 159,106
Net income attributable to holders of shares of common stock—diluted	$ 312,771	$ 183,793	$ 159,106
Denominator:
Weighted average shares of common stock outstanding—basic (in shares)	65,785,042	62,152,870	62,213,414
Weighted average number of incremental shares issuable from unvested restricted stock and restricted stock units, as calculated using the treasury stock method (in shares)	2,886,206	3,572,646	3,632,718
Weighted average shares of common stock outstanding—diluted (in shares)	68,671,248	65,725,516	65,846,132
Basic (in usd per share)	$ 4.75	$ 2.96	$ 2.56
Diluted (in usd per share)	$ 4.55	$ 2.80	$ 2.42

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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