Schedule II - Valuation and Qualifying Accounts - Allowance Rollforward (Details) (Allowance for doubtful accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,099	$ 1,324	$ 715
Charged (Credited) to Costs and Expenses	1	(13)	125
From Acquisition	0	(28)	484
Deductions	(397)	(184)	0
Balance at End of Period	$ 703	$ 1,099	$ 1,324