CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 84,559	$ 97,282
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,479	4,049
Right-of-use asset amortization	3,251	0
Net foreign currency (gains) losses	(162)	318
Stock-based compensation	16,834	15,200
Deferred income taxes	(10)	(47,474)
Provision for bad debts	1,264	827
Other non-cash operating activities	215	217
Changes in assets and liabilities:
Accounts receivable	(4,539)	(16,464)
Contract assets	(22,521)	(41,928)
Contract costs	(830)	(2,546)
Lease liabilities	(3,396)	0
Prepaid expenses, prepaid income taxes, and other assets	(1,768)	1,744
Accounts payable, accrued expenses, income taxes payable and other liabilities	(23,105)	37,718
Deferred revenue	7,936	14,154
Net cash provided by operating activities	62,207	63,097
Cash flows from investing activities:
Purchases of property, equipment and leasehold improvements	(968)	(180)
Payments for business acquisitions, net of cash acquired	(74,219)	0
Payments for capitalized computer software costs	(70)	(189)
Net cash used in investing activities	(75,257)	(369)
Cash flows from financing activities:
Exercises of stock options	2,714	4,466
Repurchases of common stock	(100,864)	(147,423)
Payments of tax withholding obligations related to restricted stock	(5,851)	(9,654)
Deferred business acquisition payments	0	(1,200)
Proceeds from borrowings	129,163	50,000
Payments of debt issuance costs	(3,454)	0
Net cash provided by (used in) financing activities	21,708	(103,811)
Effect of exchange rate changes on cash and cash equivalents	(98)	(654)
Increase (decrease) in cash and cash equivalents	8,560	(41,737)
Cash and cash equivalents, beginning of period	71,926	96,165
Cash and cash equivalents, end of period	80,486
Supplemental disclosure of non-cash activities:
Change in purchases of property, equipment and leasehold improvements included in accounts payable and accrued expenses	(96)	5
Change in repurchases of common stock included in accounts payable and accrued expenses	(864)	2,577
Lease liabilities arising from obtaining right-of-use assets	4,824	0
Supplemental disclosure of cash flow information:
Income taxes paid, net	19,748	17,827
Interest paid	5,192	3,541
Reconciliation to amounts within the unaudited consolidated balance sheets: [Abstract]
Cash, cash equivalents, and restricted cash, end of period	$ 80,486	$ 54,428