Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 26,730,000	$ 26,552,000	$ 24,663,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,739,000	14,723,000	12,249,000
Loss on write down or disposal of property or capitalized software	412,000	210,000	153,000
Stock-based compensation expense	997,000	2,276,000	2,544,000
Provision for doubtful accounts	2,123,000	2,146,000	2,437,000
Provision for deferred income taxes	2,276,000	9,051,000	624,000
Changes in operating assets and liabilities:
Accounts receivable	(1,894,000)	(2,516,000)	(7,419,000)
Customer deposits	(4,291,000)	(537,000)	(3,588,000)
Prepaid expenses and taxes	4,845,000	(5,846,000)	4,000
Other assets	(111,000)	(311,000)	298,000
Accounts and taxes payable	814,000	(1,817,000)	85,000
Accrued liabilities	7,179,000	(8,259,000)	13,012,000
Net cash provided by operating activities	54,819,000	35,672,000	45,062,000
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of business, net of cash acquired		(45,000)	(1,235,000)
Purchase of property and equipment	(14,887,000)	(23,214,000)	(18,504,000)
Net cash used in investing activities	(14,887,000)	(23,259,000)	(19,739,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Exercise of employee stock purchase options	313,000	321,000	317,000
Exercise of common stock options	3,399,000	2,241,000	4,728,000
Tax benefits from stock options	308,000	996,000	2,267,000
Purchase of treasury stock	(30,727,000)	(21,643,000)	(30,608,000)
Net cash used in financing activities	(26,707,000)	(18,085,000)	(23,296,000)
Net increase (decrease) in cash and cash equivalents	13,225,000	(5,672,000)	2,027,000
Cash and cash equivalents at beginning of Year	6,597,000	12,269,000	10,242,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	19,822,000	6,597,000	12,269,000
Supplemental cash flow Information
Income taxes paid	9,663,000	12,935,000	13,740,000
Accrual of legal settlement			11,100,000
Accrual of software license purchase			$ 1,700,000