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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Expected tax provision at statutory income tax rates	$ 18,274	$ 11,175	$ 13,012
Income taxes at different rates	(5,247)	(2,713)	(4,299)
Research and development tax credits	(2,309)	(1,619)	(1,120)
Executive compensation	654	864	1,557
Stock-based compensation	1,794	1,446	2,261
Valuation allowance	1,024	947	764
Restructuring charges / (credits)	2	1,514	(415)
Tax reserves (releases), net	(5,570)	(8,761)	(6,912)
Audit settlement	0	0	(837)
Other, net	491	257	643
Provision for income taxes	$ 9,113	$ 3,110	$ 4,654

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