Income Tax (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Deferred tax assets:
Deferred revenue	$ 11,483	$ 8,618
Inventory valuation	224	113
Accrued compensation and benefits	3,898	3,788
Deferred compensation	1,615	1,455
State income taxes	17	255
Compensatory stock option expense	2,291	1,828
Allowance for doubtful accounts	7,182	4,235
Other	3,207	4,813
Total deferred tax assets	29,917	25,105
Deferred tax liabilities:
Accelerated depreciation	(1,876)	(2,319)
Capitalized software	(7,717)	(7,797)
Intangibles assets	(4,124)	(7,307)
Prepaid expense	(1,859)	(2,979)
Other	0	73
Total deferred tax liabilities	(15,576)	(20,329)
Deferred tax assets (liabilities), net	$ 14,341	$ 4,776