Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Cash flows from Operating Activities
NET INCOME	$ 23,014,000	$ 26,059,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,262,000	12,201,000
Loss on disposal of assets	223,000	87,000
Stock compensation expense	1,594,000	1,546,000
Write-off of uncollectible accounts	1,438,000	1,043,000
Deferred income tax	(614,000)	(643,000)
Changes in operating assets and liabilities
Accounts receivable	(436,000)	(7,330,000)
Customer deposits	1,107,000	(603,000)
Prepaid taxes and expenses	310,000	2,272,000
Other assets	220,000	408,000
Accounts and taxes payable	(5,292,000)	2,720,000
Accrued liabilities	(1,716,000)	7,851,000
Net cash provided by operating activities	33,110,000	45,611,000
Cash Flows from Investing Activities
Investment in private equity	(1,400,000)
Purchase of property and equipment	(14,806,000)	(12,677,000)
Net cash (used in) investing activities	(16,206,000)	(12,677,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(22,653,000)	(23,975,000)
Tax effect of stock option exercises	682,000	1,554,000
Exercise of common stock options	1,030,000	2,250,000
Exercise of employee stock purchase options	200,000	161,000
Net cash (used in) financing activities	(20,741,000)	(20,010,000)
Increase (decrease) in cash and cash equivalents	(3,837,000)	12,924,000
Cash and cash equivalents at beginning of period	34,866,000	19,822,000
Cash and cash equivalents at end of period	31,029,000	32,746,000
Supplemental Cash Flow Information:
Income taxes paid	16,022,000	13,335,000
Purchase of software license under finance agreement		$ 2,343,000