Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 720	$ 353	$ 103
Charged to costs and expenses	453	392	322
Deductions	(72)	(25)	(72)
Balance at end of year	1,101	720	353
Deferred Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	73,595	77,904	31,349
Charged to costs and expenses	(581)	(4,309)	46,555
Deductions	0	0	0
Balance at end of year	$ 73,014	$ 73,595	$ 77,904