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INCOME TAXES: - Reconciliation of Expected Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Computed expected income tax (benefit)	$ (37,665)	$ (41,967)	$ (45,766)
Increase (reduction) in income taxes resulting from:
State income taxes, net of federal benefit	(5,998)	(3,329)	(2,045)
Research and other tax credits	(3,141)	(1,229)	(1,174)
Effect of federal rate change on deferred taxes	0	(24,565)	0
Nondeductible expenses	426	431	418
Stock-based compensation	(5,350)	4,452	2,150
Non-U.S. subsidiaries taxed at other rates	1,343	332	714
Adjustment to valuation allowances	5,204	0	0
Other, net	(228)	152	519
Total income tax expense (benefit)	$ (45,409)	$ (65,723)	$ (45,184)

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