Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,057,177	$ 1,053,927
Accumulated depreciation	(815,338)	(804,286)
Property, plant and equipment	241,839	249,641
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,380	22,017
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	148,805	149,451
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	793,250	798,112
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	69,442	60,903
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,197	21,260
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,103	$ 2,184