Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 632	$ 661	$ 1,223
Charged to costs and expenses	423	226	172
Deductions	(168)	(255)	(734)
Balance at end of year	$ 887	$ 632	$ 661