Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Cash flows from Operating Activities
NET INCOME	$ 21,479,000	$ 22,017,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,613,000	9,025,000
Loss on disposal of assets	158,000	120,000
Stock compensation expense	1,870,000	1,894,000
Write-off of uncollectible accounts	1,602,000	1,939,000
Deferred income tax	(673,000)	(986,000)
Changes in operating assets and liabilities
Accounts receivable	1,243,000	(1,428,000)
Customer deposits	608,000	(1,528,000)
Prepaid taxes and expenses	(385,000)	2,312,000
Other assets	(272,000)	210,000
Accounts and taxes payable	(330,000)	1,127,000
Accrued liabilities	(7,888,000)	3,488,000
Net cash provided by operating activities	28,025,000	38,190,000
Cash Flows from Investing Activities
Acquisition, net of cash	(45,000)	(1,235,000)
Purchase of property and equipment	(16,715,000)	(13,619,000)
Net cash (used in) investing activities	(16,760,000)	(14,854,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(16,264,000)	(22,780,000)
Tax effect of stock option exercises	1,009,000	1,757,000
Exercise of common stock options	1,629,000	3,054,000
Exercise of employee stock purchase options	157,000	160,000
Net cash (used in) financing activities	(13,469,000)	(17,809,000)
Increase in cash and cash equivalents	(2,204,000)	5,527,000
Cash and cash equivalents at beginning of period	12,269,000	10,242,000
Cash and cash equivalents at end of period	10,065,000	15,769,000
Supplemental Cash Flow Information:
Income taxes paid	12,707,000	8,954,000
Purchase of software license under finance agreement	861,000	1,700,000
Accrual of legal settlement	$ 2,800,000