Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,030,587	$ 1,057,177
Accumulated depreciation	(821,276)	(815,338)
Property, plant and equipment	209,311	241,839
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,642	22,380
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	140,895	148,805
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	783,288	793,250
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	68,706	69,442
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,653	21,197
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,403	$ 2,103