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INCOME TAXES: - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 15,415	$ 12,870	$ 10,906
Increases related to prior year tax positions	325	1,134	307
Decreases related to prior year tax positions	(292)	(208)	(466)
Increases related to current year tax positions	5,483	3,172	2,123
Lapse of statute of limitations	(1,331)	(1,553)	0
Balance at end of period	$ 19,600	$ 15,415	$ 12,870

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Amount of unrecognized tax benefits.

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-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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