Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net earnings	$ 414,162	$ 359,910	$ 1,145,868	$ 964,834
Adjustments to reconcile net earnings to net cash from operating activities:
Provisions for losses on accounts receivable	5,570	3,739	9,917	6,028
Deferred income tax (benefit) expense	(3,070)	(7,658)	(14,928)	2,343
Stock compensation expense	14,175	15,204	51,296	57,298
Depreciation and amortization	15,187	12,753	42,416	38,415
Other, net	1,435	626	144	1,523
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	634,421	(714,300)	880,364	(1,377,997)
(Decrease) increase in accounts payable and accrued expenses	(350,922)	436,343	(343,902)	769,525
Decrease (increase) in deferred contract costs	226,087	(328,932)	437,155	(550,572)
(Decrease) increase in contract liabilities	(249,895)	381,192	(488,826)	635,286
(Decrease) increase in income taxes payable, net	(31,397)	33,378	(78,568)	32,022
(Increase) decrease in other, net	(5,369)	(14,884)	2,040	(15,208)
Net cash from operating activities	670,384	177,371	1,642,976	563,497
Investing Activities:
Purchase of property and equipment	(15,928)	(9,870)	(68,498)	(24,800)
Other, net	(590)	(157)	(645)	(53)
Net cash from investing activities	(16,518)	(10,027)	(69,143)	(24,853)
Financing Activities:
Payments from borrowing on lines of credit	(21,117)	(1,045)	(29,601)	(2,570)
Proceeds from borrowing on lines of credit	0	8,524	56,545	10,138
Proceeds from issuance of common stock	61,885	56,965	73,318	99,433
Repurchases of common stock	(469,041)	(76,595)	(1,018,106)	(225,064)
Dividends paid	0	0	(109,828)	(98,387)
Payments for taxes related to net share settlement of equity awards	0	(4)	(19,333)	(15,172)
Distribution to noncontrolling interest	(543)	(1,631)	(543)	(1,631)
Net cash from financing activities	(428,816)	(13,786)	(1,047,548)	(233,253)
Effect of exchange rate changes on cash and cash equivalents	(47,487)	(7,573)	(100,443)	(13,076)
Change in cash and cash equivalents	177,563	145,985	425,842	292,315
Cash and cash equivalents at beginning of period	1,976,971	1,674,121	1,728,692	1,527,791
Cash and cash equivalents at end of period	2,154,534	1,820,106	2,154,534	1,820,106
Taxes Paid:
Income taxes	$ 150,960	$ 104,617	$ 465,711	$ 295,153