Restructuring and Asset Impairment Charges Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Restructuring Cost and Reserve [Line Items]
Asset impairment and other non-cash charges	$ 760	$ 4,130	$ 0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	246	14,824
Pension Plan Termination Effects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,271
Equipment Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8,643
Internally Developed Software [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and other non-cash charges	$ 760