Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Cash flow from operating activities:
Net income	$ 129,094	$ 95,972	$ 63,158
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	81,328	73,186	66,172
Stock-based compensation	15,329	11,168	11,131
Loss (gain) on disposal of assets	273	(884)	1,119
Deferred income taxes	(14,704)	2,830	(9,754)
Asset Impairment Charges	0	1,071	1,150
Excess Tax Benefit from Share-based Compensation, Operating Activities	(7,850)	(5,624)	(5,256)
Other Noncash (Income) Expense	(953)	659	818
Changes in assets and liabilities, net of effects from acquisitions:
Billed and unbilled accounts receivable	(23,089)	(51,292)	(20,083)
Prepaid expenses and other current assets	(10,803)	(6,751)	(1,593)
Other assets	6,780	(6,693)	(5,460)
Accounts payable	11,529	3,955	20,202
Deferred revenue	46,687	47,531	35,940
Accrued expenses and other current liabilities	28,861	18,659	63,303
Long-term income taxes payable, net of long-term income taxes receivable	13,119	(1,440)	11,958
Other liabilities	11,600	1,468	1,652
Net cash (used in) provided by operating activities	287,201	183,815	234,457
Cash flow from investing activities:
Purchases of marketable securities	(250,318)	(312,403)	(53,647)
Proceeds from sale of marketable securities	291,824	182,800	51,529
Proceeds from Collection of Notes Receivable	0	659	0
Purchases of property and equipment	(72,585)	(81,089)	(74,403)
Acquisition of businesses	(150)	(97,099)	0
Proceeds from Sale of Property, Plant, and Equipment	0	1,677	0
Net cash used in investing activities	(31,229)	(305,455)	(76,521)
Cash flow from financing activities:
Proceeds from issuance of common stock	6,762	15,271	12,120
Payments for Repurchase of Common Stock	(154,906)	(195,149)	0
Excess tax benefit from stock-based compensation	7,850	5,624	5,256
Borrowings under lines of credit	502,500	795,000	268,000
Repayments under lines of credit	(590,000)	(577,500)	(293,000)
Proceees under factoring agreement	4,497	10,394	0
Payments for deferred financing costs	(671)	(1,231)	0
(Repayments) borrowings under long-term debt	0	0	(943)
Net cash provided by (used in) financing activities	(223,968)	52,409	(8,567)
Effect of Exchange Rate on Cash and Cash Equivalents	12,140	(321)	(24,846)
Net (decrease) increase in cash and cash equivalents	44,144	(69,552)	124,523
Cash and cash equivalents at beginning of year	144,027	213,579	89,056
Cash and cash equivalents at end of year	188,171	144,027	213,579
Supplemental disclosures of cash flow information
Non-cash debt settlement under factoring agreement	14,891	0	0
Interest paid	13,710	9,962	10,802
Income taxes, net of refunds	$ 61,027	$ 37,764	$ 9,709