Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 34,392,000	$ 26,730,000	$ 26,552,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,411,000	15,739,000	14,723,000
Loss on write down or disposal of property or capitalized software	78,000	412,000	210,000
Stock-based compensation expense	2,140,000	997,000	2,276,000
Provision for doubtful accounts	1,332,000	2,123,000	2,146,000
Provision for deferred income taxes	(2,519,000)	2,276,000	9,051,000
Changes in operating assets and liabilities:
Accounts receivable	(9,456,000)	(1,894,000)	(2,516,000)
Customer deposits	(6,035,000)	(4,291,000)	(537,000)
Prepaid expenses and taxes	1,556,000	4,845,000	(5,846,000)
Other assets	159,000	(111,000)	(311,000)
Accounts and taxes payable	2,535,000	814,000	(1,817,000)
Accrued liabilities	14,207,000	7,179,000	(8,259,000)
Net cash provided by operating activities	54,800,000	54,819,000	35,672,000
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of business, net of cash acquired			(45,000)
Purchases of property and equipment	(18,344,000)	(14,887,000)	(23,214,000)
Net cash used in investing activities	(18,344,000)	(14,887,000)	(23,259,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Exercise of employee stock purchase options	346,000	313,000	321,000
Exercise of common stock options	3,386,000	3,399,000	2,241,000
Tax benefits from stock options	2,035,000	308,000	996,000
Purchase of treasury stock	(27,179,000)	(30,727,000)	(21,643,000)
Net cash used in financing activities	(21,412,000)	(26,707,000)	(18,085,000)
Net increase (decrease) in cash and cash equivalents	15,044,000	13,225,000	(5,672,000)
Cash and cash equivalents at beginning of year	19,822,000	6,597,000	12,269,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	34,866,000	19,822,000	6,597,000
Supplemental cash flow information
Income taxes paid	20,791,000	9,663,000	12,935,000
Accrual of software license purchase	$ 2,343,000