Discontinued Operation and Related Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2012
Restructuring reserve
Restructuring reserve as of March 31, 2012	$ 830
Cash paid	(612)
Non-cash reductions	(92)
Restructuring reserve as of September 30, 2012	126
Employee Termination Costs [Member]
Restructuring reserve
Restructuring reserve as of March 31, 2012	750
Cash paid	(585)
Non-cash reductions	(45)
Restructuring reserve as of September 30, 2012	120
Facility and Other Costs [Member]
Restructuring reserve
Restructuring reserve as of March 31, 2012	80
Cash paid	(27)
Non-cash reductions	(47)
Restructuring reserve as of September 30, 2012	$ 6