Income Taxes (Components Of Net Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Accrued expenses	$ 3,841	$ 3,475
Depreciation	1,333	1,639
Deferred revenue	5,743	6,750
Reserves	892	648
Net operating loss carryforwards	22,622	20,933
Tax credit carryforwards	1,994	1,994
Share-based compensation	760	522
Auction rate securities temporary impairment	73	883
Other	264	434
Deferred tax assets, net	37,522	37,278
Intangible assets	(13,274)	(8,479)
Share-based compensation	0	0
Valuation allowance	(3,529)	(249)
Deferred tax assets (liabilities), net	$ 20,719	$ 28,550