Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 1,101	$ 720	$ 353
Charged to costs and expenses	1,219	453	392
Deductions	(1,432)	(72)	(25)
Balance at end of year	888	1,101	720
Deferred Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	73,014	73,595	77,904
Charged to costs and expenses	3,406	0	0
Deductions	0	(581)	(4,309)
Balance at end of year	$ 76,420	$ 73,014	$ 73,595