CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 38,066	$ 34,755
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,000
Net foreign currency (gains) losses	(200)
Stock-based compensation	8,865
Deferred income taxes	(44,670)
Provision for bad debts	169
Other non-cash operating activities	107	0
Changes in assets and liabilities:
Accounts receivable, net	(12,529)	504
Contract assets	(30,914)	0
Contract costs	(796)	0
Prepaid expenses, prepaid income taxes, and other assets	(855)
Accounts payable, accrued expenses, income taxes payable and other liabilities	34,924
Deferred revenue	11,403	(40,037)
Net cash provided by operating activities	5,570	12,360
Cash flows from investing activities:
Purchases of property, equipment and leasehold improvements	(96)
Payments for capitalized computer software costs	(90)
Net cash used in investing activities	(186)
Cash flows from financing activities:
Exercises of stock options	4,054
Repurchases of common stock	(49,977)
Payments of tax withholding obligations related to restricted stock	(3,179)
Deferred business acquisition payments	0
Payments of credit agreement issuance costs	0
Net cash used in financing activities	(49,102)
Effect of exchange rate changes on cash and cash equivalents	(399)
Decrease in cash and cash equivalents	(44,117)
Cash and cash equivalents, beginning of period	96,165
Cash and cash equivalents, end of period	52,048
Supplemental disclosure of non-cash investing and financing activities:
Change in purchases of property, equipment and leasehold improvements included in accounts payable and accrued expenses	(11)
Change in repurchases of common stock included in accounts payable and accrued expenses	23
Supplemental disclosure of cash flow information:
Income taxes paid, net	2,755
Interest paid	1,538
Accounting Standards Update 2014-09 [Member]
Cash flows from operating activities:
Net income		40,521
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		1,753
Net foreign currency (gains) losses		936
Stock-based compensation		6,414
Deferred income taxes		(33)
Provision for bad debts		20
Changes in assets and liabilities:
Accounts receivable, net		(9,093)
Contract assets		35,791
Contract costs		185
Prepaid expenses, prepaid income taxes, and other assets		2,292
Accounts payable, accrued expenses, income taxes payable and other liabilities		6,764
Deferred revenue		(1,238)
Net cash provided by operating activities		12,360
Cash flows from investing activities:
Purchases of property, equipment and leasehold improvements		(123)
Payments for capitalized computer software costs		(65)
Net cash used in investing activities		(188)
Cash flows from financing activities:
Exercises of stock options		2,411
Repurchases of common stock		(55,109)
Payments of tax withholding obligations related to restricted stock		(1,650)
Deferred business acquisition payments		(600)
Payments of credit agreement issuance costs		(351)
Net cash used in financing activities		(55,299)
Effect of exchange rate changes on cash and cash equivalents		156
Decrease in cash and cash equivalents		(42,971)
Cash and cash equivalents, beginning of period	$ 96,165	101,954
Cash and cash equivalents, end of period		58,983
Supplemental disclosure of non-cash investing and financing activities:
Change in purchases of property, equipment and leasehold improvements included in accounts payable and accrued expenses		(70)
Change in repurchases of common stock included in accounts payable and accrued expenses		(5,109)
Supplemental disclosure of cash flow information:
Income taxes paid, net		1,243
Interest paid		$ 968