INCOME TAXES: - Reconciliation of Income Tax Benefit from Continuing Operations and Valuation Allowance Change (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of income tax expense computed using the U.S. federal statutory income tax rate of 35% of earnings before income taxes to the actual provision for income taxes for continuing operations
U.S. federal statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
Computed expected tax benefit	$ (7,098)	$ (14,472)	$ (1,855)
Increase (reduction) in income taxes resulting from:
State income taxes, net of federal benefit	(1,796)	(441)	(371)
Research and other tax credits	(4,027)	(6,369)	(5,251)
Impairment of goodwill and intangibles			5,368
Share-based compensation	1,857	2,276
Non-U.S. subsidiaries taxed at other than 35%	2,468	4,354	5,875
Adjustment to valuation allowances	(3,585)	(776)	7,604
Other, net	549	623	670
Total	(11,632)	$ (14,805)	12,040
Foreign jurisdiction
Valuation allowance
Valuation allowances (released)/increased	$ (3,600)		$ 7,600