CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 301,171	$ 163,671	$ 142,799
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	72,196	71,760	64,752
Amortization of deferred financing costs	4,061	4,484	3,234
Loss on extinguishment of debt	104
Loss on disposal of assets	989	1,025
Stock-based compensation expense	23,628	21,945	17,919
Deferred income taxes	(77,324)	15,148	13,568
Equity in earnings of unconsolidated ventures		(167)	(204)
Gain on sale of assets		(1,545)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable, net	(42,575)	46,158	(105)
Prepaid expenses and other assets	(5,479)	(5,221)	(8,408)
Accounts payable and other accrued expenses	1,097	(46,825)	2,427
Accrued compensation and benefits	13,544	12,048	4,320
Income taxes payable and receivable	6,090	(9,954)	14,868
Deferred rent	(183)	(952)	(9,631)
Long-term liabilities	27,808	9,675	(2,962)
Net cash provided by operating activities	325,127	281,250	242,577
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(41,594)	(43,268)	(20,835)
Cash paid for business acquisitions, net of cash acquired	(76,910)	(7,276)	(587,821)
Proceeds from net working capital and other refunds of acquired business		19,287
Proceeds from equity method investments		4,681
Other	231	1,772	1,069
Net cash used in investing activities	(118,273)	(24,804)	(607,587)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings under bank credit facilities, net of financing costs	477,000	485,500	1,058,500
Principal payments made under bank credit facilities	(647,474)	(714,465)	(659,965)
Payment of financing costs under bank credit facilities	(2,915)		(9,290)
Payment of contingent consideration	(11,553)
Proceeds from employee stock purchase plans	4,929	4,316	3,086
Repurchases of common stock	(5,138)	(4,386)	(3,230)
Payment of taxes for equity transactions	(21,365)	(10,951)	(8,045)
Other			451
Net cash (used in) provided by financing activities	(206,516)	(239,986)	381,507
Effect of exchange rate changes on cash and cash equivalents	317	(3)	(2,779)
Net increase in cash and cash equivalents	655	16,457	13,718
Cash and cash equivalents, beginning of year	65,539	49,082	35,364
Cash and cash equivalents, end of year	66,194	65,539	49,082
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for income taxes, net of refunds	57,941	79,268	54,970
Cash paid during the period for interest	40,100	45,015	37,429
Non-cash financing and investing activities:
Accrued capital expenditures	$ 609	$ 667	$ 2,170