Provision for Taxes (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating losses potentially not utilized	$ 29,000
Unrecognized tax benefits	26,720	$ 23,912	$ 19,929
Tax expense (net of settlements)	2,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Unrecognized tax benefits, income tax penalties and interest accrued	5,900	$ 5,200
Unrecognized tax benefits, income tax penalties and interest expense	$ 800