Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 888	$ 1,101	$ 720
Charged to costs and expenses	942	1,219	453
Deductions	(1,213)	(1,432)	(72)
Balance at end of year	617	888	1,101
Deferred Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	76,420	73,014	73,595
Charged to costs and expenses	1,426	3,406	0
Deductions	0	0	(581)
Balance at end of year	$ 77,846	$ 76,420	$ 73,014