CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 158,869	$ 110,668
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,063
Net foreign currency losses	23
Stock-based compensation	21,454
Deferred income taxes	(49,847)	4,467
Provision for bad debts	474
Other non-cash operating activities	341
Changes in assets and liabilities:
Accounts receivable	(4,183)	964
Contract assets	(27,397)	0
Contract costs	(3,825)	0
Prepaid expenses, prepaid income taxes, and other assets	201
Accounts payable, accrued expenses, income taxes payable and other liabilities	32,980
Deferred revenue	17,983	(11,699)
Net cash provided by operating activities	153,136	127,829
Cash flows from investing activities:
Purchases of property, equipment and leasehold improvements	(206)
Payments for business acquisitions, net of cash	0
Payments for capitalized computer software costs	(1,094)
Net cash used in investing activities	(1,300)
Cash flows from financing activities:
Exercises of stock options	5,881
Repurchases of common stock	(224,182)
Payments of tax withholding obligations related to restricted stock	(11,916)
Deferred business acquisition payments	(1,700)
Proceeds from credit agreement	50,000
Payments of credit agreement issuance costs	0
Net cash used in financing activities	(181,917)
Effect of exchange rate changes on cash and cash equivalents	(492)
Decrease in cash and cash equivalents	(30,573)
Cash and cash equivalents, beginning of period	96,165
Cash and cash equivalents, end of period	65,592
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	10
Change in repurchases of common stock included in accounts payable and accrued expenses	818
Supplemental disclosure of cash flow information:
Income taxes paid, net	39,123
Interest paid	5,728
Accounting Standards Update 2014-09 [Member]
Cash flows from operating activities:
Net income		217,057
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		4,902
Net foreign currency losses		1,086
Stock-based compensation		17,222
Deferred income taxes		(123,443)
Provision for bad debts		1,373
Other non-cash operating activities		314
Changes in assets and liabilities:
Accounts receivable		1,429
Contract assets		(7,767)
Contract costs		(651)
Prepaid expenses, prepaid income taxes, and other assets		4,908
Accounts payable, accrued expenses, income taxes payable and other liabilities		(4,448)
Deferred revenue		15,847
Net cash provided by operating activities		127,829
Cash flows from investing activities:
Purchases of property, equipment and leasehold improvements		(217)
Payments for business acquisitions, net of cash		(33,700)
Payments for capitalized computer software costs		(299)
Net cash used in investing activities		(34,216)
Cash flows from financing activities:
Exercises of stock options		7,402
Repurchases of common stock		(154,365)
Payments of tax withholding obligations related to restricted stock		(5,412)
Deferred business acquisition payments		(2,600)
Proceeds from credit agreement		30,000
Payments of credit agreement issuance costs		(351)
Net cash used in financing activities		(125,326)
Effect of exchange rate changes on cash and cash equivalents		834
Decrease in cash and cash equivalents		(30,879)
Cash and cash equivalents, beginning of period	$ 96,165	101,954
Cash and cash equivalents, end of period		71,075
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		(31)
Change in repurchases of common stock included in accounts payable and accrued expenses		(4,365)
Supplemental disclosure of cash flow information:
Income taxes paid, net		38,662
Interest paid		$ 3,456