Restructuring Charges - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Restructuring Charges (Textual) [Abstract]
Asset impairment	$ 300
December 2012 Restructuring Program [Member]
Restructuring Charges (Textual) [Abstract]
Number of positions eliminated or relocated under restructuring program	70
April 2011 Restructuring Program [Member]
Restructuring Charges (Textual) [Abstract]
Number of positions eliminated or relocated under restructuring program		25
Severance cost		900
Employee Severance [Member] \| December 2012 Restructuring Program [Member]
Restructuring Charges (Textual) [Abstract]
Severance cost	1,716	913
Impairment of Intangible Assets [Member] \| December 2012 Restructuring Program [Member]
Restructuring Charges (Textual) [Abstract]
Asset impairment	$ 4,719	$ 0

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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