Significant Accounting Policies (As Restated) Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 366,171	$ 416,136
Less accumulated depreciation	(128,257)	(154,962)
Total property, plant and equipment, net	237,914	261,174
Property and equipment purchases	22,673	27,755	$ 42,803
Property and equipment purchases, amount unpaid	1,024	4,322	2,743
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,564	31,517
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	170,937	183,175
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	173,670	201,444
Cost of Sales [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	24,179	25,706	25,939
Operating Expense [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 2,998	$ 3,209	$ 3,112
Minimum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Useful life, minimum (in years)	20 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life, minimum (in years)	3 years
Maximum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Useful life, minimum (in years)	30 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life, minimum (in years)	10 years