Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating Activities:
Net earnings	$ 183,919	$ 175,151	$ 388,018	$ 345,551
Adjustments to reconcile net earnings to net cash from operating activities:
Provisions for losses on accounts receivable	1,051	1,644	1,812	2,038
Deferred income tax benefit	(7,523)	(6,917)	(7,447)	(4,623)
Stock compensation expense	27,267	25,704	38,816	38,076
Depreciation and amortization	13,847	14,979	28,451	30,140
Other, net	4,474	1,885	6,765	3,870
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(57,984)	(286,085)	50,165	(346,627)
Increase in accounts payable and accrued liabilities	61,885	211,692	43,466	295,283
(Increase) decrease in deferred contract costs	(21,617)	(122,258)	54,356	(186,320)
Increase (decrease) in contract liabilities	16,961	135,067	(72,327)	204,375
Decrease in income taxes payable, net	(44,668)	(29,854)	(14,328)	(7,168)
Decrease in other, net	1,600	5,761	4,087	9,078
Net cash from operating activities	179,212	126,769	521,834	383,673
Investing Activities:
Purchase of property and equipment	(15,875)	(7,943)	(29,027)	(18,124)
Other, net	24	66	180	163
Net cash from investing activities	(15,851)	(7,877)	(28,847)	(17,961)
Financing Activities:
Proceeds from borrowings on lines of credit	194	4,082	624	4,126
Payments on borrowings on lines of credit	(102)	(2,823)	(337)	(20,109)
Proceeds from issuance of common stock	5,132	6,449	18,175	14,478
Repurchases of common stock	(231,116)	(102,300)	(408,470)	(462,824)
Dividends paid	(104,139)	(102,638)	(104,139)	(102,638)
Payments for taxes related to net share settlement of equity awards	(9,844)	(10,163)	(10,353)	(15,348)
Distribution to noncontrolling interest	0	0	(1,346)	0
Net cash from financing activities	(339,875)	(207,393)	(505,846)	(582,315)
Effect of exchange rate changes on cash and cash equivalents	14,156	(10,102)	20,701	(24,427)
Change in cash and cash equivalents	(162,358)	(98,603)	7,842	(241,030)
Cash and cash equivalents at beginning of period	1,318,520	1,370,456	1,148,320	1,512,883
Cash and cash equivalents at end of period	1,156,162	1,271,853	1,156,162	1,271,853
Taxes Paid:
Income taxes	$ 125,277	$ 96,739	$ 165,901	$ 133,603