Consolidated Statements of Cash Flows (USD $) In Thousands	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Cash flows from operating activities:
Net income	$ 61,606	$ 48,379	$ 46,119
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,304	3,663	2,911
Amortization of capitalized software costs	7,091	5,927	5,163
Amortization of other intangibles	3,255	1,783	1,034
Provision for bad debts	3,780	3,465	2,089
Provision (recovery) for inventory obsolescence	27	27	(13)
Share-based compensation	3,748	2,073	1,977
Deferred income tax (benefit) expense	(4,194)	(786)	4,462
Tax benefit associated with stock options	1,524	1,576	3,382
Excess tax benefit from share-based compensation	(1,524)	(1,576)	(3,381)
Loss (gain) on disposal of equipment and improvements	(33)		96
Changes in assets and liabilities, net of amounts acquired:
Accounts receivable	(36,094)	(18,944)	(11,369)
Inventories	(620)	(238)	(88)
Income taxes receivable	2,953	3,875	(5,433)
Other current assets	(2,074)	(2,310)	(1,202)
Other assets	(1,817)	(894)	(448)
Accounts payable	3,344	(1,810)	(299)
Deferred revenue	13,211	12,528	3,130
Accrued compensation and related benefits	1,296	(1,006)	136
Income taxes payable	3,530	(1,404)	(1,541)
Other current liabilities	13,096	846	2,055
Deferred compensation	605	46	(68)
Other noncurrent liabilities	(6,950)
Net cash provided by operating activities	70,064	55,220	48,712
Cash flows from investing activities:
Additions to capitalized software costs	(10,695)	(7,921)	(5,863)
Additions to equipment and improvements	(6,804)	(4,935)	(3,218)
Proceeds from disposal of equipment and improvements	336
Proceeds from sale of marketable securities	7,700	425	14,825
Purchases of marketable securities	(1,120)
Payment of contingent consideration related to purchase of PMP		(3,000)
Net cash used in investing activities	(10,583)	(13,945)	(19,447)
Cash flows from financing activities:
Excess tax benefit from share-based compensation	1,524	1,576	3,381
Proceeds from exercise of stock options	5,717	5,855	12,519
Dividends paid	(34,716)	(34,275)	(30,763)
Loan repayment			(3,268)
Net cash used in financing activities	(27,475)	(26,844)	(18,131)
Net increase in cash and cash equivalents	32,006	14,431	11,134
Cash and cash equivalents at beginning of period	84,611	70,180	59,046
Cash and cash equivalents at end of period	116,617	84,611	70,180
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes, net of refunds	29,044	24,506	26,455
Non-cash investing activities:
Tenant improvement allowance received from landlord	1,970
Unrealized gain on marketable securities, net of tax			196
Issuance of stock options with fair value of $433 in connection with the acquisition of PMP		433
Opus
Cash flows from investing activities:
Cash acquired from purchase of Opus		2,036
Purchase of businesses		(250)
Effective February 10, 2010, August 12, 2009, October 28, 2008 and May 20, 2008 the Company acquired Opus, NextGen IS, PMP and HSI respectively in a transaction summarized as follows:
Fair value of net assets acquired		32,209
Cash paid		(250)
Common stock issued		(8,815)
Fair value of contingent consideration		(11,516)
Liabilities assumed		11,628
PMP
Cash flows from investing activities:
Purchase of businesses			(16,950)
Effective February 10, 2010, August 12, 2009, October 28, 2008 and May 20, 2008 the Company acquired Opus, NextGen IS, PMP and HSI respectively in a transaction summarized as follows:
Fair value of net assets acquired			23,875
Cash paid			(16,950)
Common stock issued			(2,750)
Liabilities assumed			4,175
HSI
Cash flows from investing activities:
Purchase of businesses			(8,241)
Effective February 10, 2010, August 12, 2009, October 28, 2008 and May 20, 2008 the Company acquired Opus, NextGen IS, PMP and HSI respectively in a transaction summarized as follows:
Fair value of net assets acquired			20,609
Cash paid			(8,241)
Common stock issued			(7,350)
Liabilities assumed			5,018
NextGen IS
Cash flows from investing activities:
Purchase of businesses		(300)
Effective February 10, 2010, August 12, 2009, October 28, 2008 and May 20, 2008 the Company acquired Opus, NextGen IS, PMP and HSI respectively in a transaction summarized as follows:
Fair value of net assets acquired		1,453
Cash paid		(300)
Fair value of contingent consideration		(1,074)
Liabilities assumed		$ 79