Segment and geographic information Tangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 85,992	$ 102,842
Domestic Segment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	67,014	87,134
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	11,022	10,185
Rest Of The World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 7,956	$ 5,523