Restructuring and Asset Impairment Charges Cash Payments by Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Employee separation and other cash charges (recoveries)	$ 8,618	$ 2,275	$ (55)
Total cash payments	(928)	(2,546)	(1,237)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Employee separation and other cash charges (recoveries)	8,618	2,275	(55)
Adjustments to employee separation and other cash charges	0	0	186
Cash paid 2013	0	0	0
Cash paid 2014	0	(2,064)	0
Cash paid 2015	(531)	(211)	(186)
Adjustment	0	0	55
Balance at	8,087	0	0
Total cash payments	$ (928)	$ (2,064)	$ 0