Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 28,525,000	$ 28,590,000	$ 34,392,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,952,000	17,995,000	16,411,000
Loss on write down or disposal of property or capitalized software	286,000	285,000	78,000
Stock-based compensation expense	2,192,000	2,209,000	2,140,000
Provision for doubtful accounts	1,357,000	1,730,000	1,332,000
Provision for deferred income taxes	(1,656,000)	304,000	(2,519,000)
Changes in operating assets and liabilities:
Accounts receivable	(3,567,000)	(2,038,000)	(9,456,000)
Customer deposits	(8,331,000)	(1,176,000)	(6,035,000)
Prepaid expenses and taxes	6,742,000	(5,813,000)	1,556,000
Other assets	(516,000)	(18,000)	159,000
Accounts and taxes payable	(2,537,000)	(2,695,000)	2,535,000
Accrued liabilities	8,864,000	4,943,000	14,207,000
Net cash provided by operating activities	51,311,000	44,316,000	54,800,000
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in private equity	(600,000)	(1,400,000)	0
Purchases of property and equipment	(16,756,000)	(22,868,000)	(18,344,000)
Net cash used in investing activities	(17,356,000)	(24,268,000)	(18,344,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Exercise of employee stock purchase options	371,000	400,000	346,000
Exercise of common stock options	3,749,000	1,603,000	3,386,000
Tax benefits from stock options	713,000	397,000	2,035,000
Purchase of treasury stock	(31,525,000)	(31,798,000)	(27,179,000)
Net cash used in financing activities	(26,692,000)	(29,398,000)	(21,412,000)
Net increase (decrease) in cash and cash equivalents	7,263,000	(9,350,000)	15,044,000
Cash and cash equivalents at beginning of year	25,516,000	34,866,000	19,822,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	32,779,000	25,516,000	34,866,000
Supplemental cash flow information
Income taxes paid	13,589,000	19,528,000	20,791,000
Accrual of software license purchase	3,249,000	0	2,343,000
Tenant improvement allowance	$ 0	$ 3,100,000	$ 0