Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 62,623	$ 58,105
Short-term investments	26,378	23,055
Accounts receivable, net of allowance of $1,007 and $582 at December 31, 2012 and March 31, 2012, respectively	65,131	58,789
Unbilled accounts receivable	10,010	7,634
Prepaid expenses	5,744	6,552
Deferred income taxes	3,370	3,693
Restricted cash	390	2,828
Other current assets	6,856	5,831
Total current assets	180,502	166,487
Property and equipment, net of accumulated depreciation of $27,317 and $23,803 at December 31, 2012 and March 31, 2012, respectively	35,178	32,843
Long-term investments	8,006	4,269
Deferred income taxes	8,504	8,348
Goodwill	35,472	35,472
Intangible assets, net	16,322	18,248
Other long-term assets	9,844	7,726
Total assets	293,828	273,393
Current liabilities:
Accounts payable	9,067	8,649
Accrued employee compensation and benefits	17,502	17,844
Accrued expenses and other current liabilities	19,525	22,011
Income taxes payable	7,705	3,553
Total current liabilities	53,799	52,057
Long-term liabilities	2,920	3,162
Total liabilities	56,719	55,219
Commitments and guarantees
Stockholders' equity:
Undesignated preferred stock, $0.01 par value: Authorized 5,000,000 shares at December 31, 2012 and March 31, 2012; zero shares issued and outstanding at December 31, 2012 and March 31, 2012
Common stock, $0.01 par value: Authorized 120,000,000 shares at December 31, 2012 and March 31, 2012; issued 26,845,205 and 26,553,299 shares at December 31, 2012 and March 31, 2012, respectively; outstanding 24,988,502 and 24,793,911 shares at December 31, 2012 and March 31, 2012, respectively	268	266
Treasury stock, 1,856,703 and 1,759,388 common shares, at cost, at December 31, 2012 and March 31, 2012, respectively	(9,652)	(8,244)
Additional paid-in capital	169,332	165,646
Retained earnings	98,156	78,849
Accumulated other comprehensive loss	(20,995)	(18,343)
Total stockholders' equity	237,109	218,174
Total liabilities, undesignated preferred stock and stockholders' equity	$ 293,828	$ 273,393