Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 66,410,000	$ 46,356,000	$ 47,377,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,916,000	23,436,000	22,516,000
Loss on write down or disposal of property, capitalized software or investment	122,000	590,000	149,000
Stock compensation expense	5,198,000	4,978,000	4,485,000
Provision for doubtful accounts	158,000	2,021,000	1,606,000
Deferred income taxes	2,302,000	(8,376,000)	1,470,000
Changes in operating assets and liabilities:
Accounts receivable	(18,022,000)	(976,000)	3,964,000
Customer deposits	(13,284,000)	(7,507,000)	(3,723,000)
Prepaid expenses and income taxes	(7,116,000)	3,003,000	(3,834,000)
Other assets	(135,000)	504,000	(595,000)
Accounts and income taxes payable	1,423,000	(3,355,000)	1,095,000
Accrued liabilities	8,052,000	31,561,000	11,885,000
Operating lease liabilities	(1,802,000)	2,144,000	(5,569,000)
Net cash provided by operating activities	67,222,000	94,379,000	80,826,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(29,819,000)	(17,243,000)	(32,360,000)
Net cash used in investing activities	(29,819,000)	(17,243,000)	(32,360,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Exercise of employee stock purchase options	564,000	534,000	505,000
Exercise of common stock options	9,906,000	11,494,000	8,147,000
Purchase of treasury stock	(90,085,000)	(32,671,000)	(65,608,000)
Net cash used in financing activities	(79,615,000)	(20,643,000)	(56,956,000)
Net increase (decrease) in cash and cash equivalents	(42,212,000)	56,493,000	(8,490,000)
Cash and cash equivalents at beginning of year	139,716,000	83,223,000	91,713,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	97,504,000	139,716,000	83,223,000
Supplemental cash flow information
Income taxes paid	19,405,000	20,760,000	15,077,000
Accrual of software license purchase	$ 0	$ 0	$ 3,790,000