CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 46,284	$ 38,066
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,036	2,000
Right-of-use asset amortization	1,887	0
Net foreign currency losses (gains)	721	(200)
Stock-based compensation	9,275	8,865
Deferred income taxes	(182)	(44,670)
(Recovery from) provision for bad debts	982	34
Other non-cash operating activities	107	107
Changes in assets and liabilities:
Accounts receivable	(1,945)	(12,394)
Contract assets	(25,440)	(30,914)
Contract costs	(345)	(796)
Lease liabilities	(1,932)	0
Prepaid expenses, prepaid income taxes, and other assets	(2,092)	(855)
Accounts payable, accrued expenses, income taxes payable and other liabilities	(12,741)	34,924
Deferred revenue	(1,355)	11,403
Net cash provided by operating activities	15,260	5,570
Cash flows from investing activities:
Purchases of property, equipment and leasehold improvements	(600)	(96)
Payments for business acquisitions, net of cash acquired	(74,219)	0
Payments for capitalized computer software costs	(9)	(90)
Net cash used in investing activities	(74,828)	(186)
Cash flows from financing activities:
Exercises of stock options	1,018	4,054
Repurchases of common stock	(50,848)	(49,977)
Payments of tax withholding obligations related to restricted stock	(3,166)	(3,179)
Proceeds from credit agreement	100,000	0
Net cash provided by (used in) financing activities	47,004	(49,102)
Effect of exchange rate changes on cash and cash equivalents	(729)	(399)
Decrease in cash, cash equivalents, and restricted cash	(13,293)	(44,117)
Cash and cash equivalents, beginning of period	71,926	96,165
Cash, cash equivalents, and restricted cash, end of period	57,943
Supplemental disclosure of non-cash activities:
Change in purchases of property, equipment and leasehold improvements included in accounts payable and accrued expenses	160	(11)
Change in repurchases of common stock included in accounts payable and accrued expenses	(848)	23
Lease liabilities arising from obtaining right-of-use assets	3,272	0
Supplemental disclosure of cash flow information:
Income taxes paid, net	10,284	2,755
Interest paid	2,801	1,538
Reconciliation to amounts within the unaudited consolidated balance sheets: [Abstract]
Restricted cash included in other non-current assets	690
Cash, cash equivalents, and restricted cash, end of period	$ 58,633	$ 52,048