UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' INVESTMENT - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,376,363,789	$ 2,123,255,648	$ 2,312,517,069	[1]	$ 2,065,792,821
Issuance of common stock from stock plan transactions	3,408,322	7,926,787	$ 20,242,309		13,882,810
Repurchases of common stock (in shares)			(2,600,000)
Repurchases of common stock	(48,299,574)	(25,103,491)	$ (91,338,662)		(53,566,122)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock	10,922,998	9,744,670	21,396,790		18,264,205
Dividends declared	(27,627,119)	(28,011,420)	(55,370,601)		(56,058,218)
Net income	86,040,438	109,155,403	194,271,153		206,733,664
Other comprehensive income (loss)	(509,327)	(1,018,271)	(1,418,531)		900,166
Ending balance	$ 2,400,299,527	$ 2,195,949,326	$ 2,400,299,527		$ 2,195,949,326
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	231,198,885	233,726,045	231,455,443		234,169,335
Beginning balance	$ 13,871,933	$ 14,023,563	$ 13,887,326		$ 14,050,160
Issuance of common stock from stock plan transactions (in shares)	433,321	624,323	1,377,666		1,227,959
Issuance of common stock from stock plan transactions	$ 25,999	$ 37,459	$ 82,660		$ 73,677
Repurchases of common stock (in shares)	(1,402,667)	(920,374)	(2,603,570)		(1,967,300)
Repurchases of common stock	$ (84,160)	$ (55,223)	$ (156,214)		$ (118,038)
Ending balance (in shares)	230,229,539	233,429,994	230,229,539		233,429,994
Ending balance	$ 13,813,772	$ 14,005,799	$ 13,813,772		$ 14,005,799
Additional  Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	991,053,652	928,284,892	968,245,875		917,499,323
Issuance of common stock from stock plan transactions	3,382,323	7,889,328	20,159,649		13,809,133
Repurchases of common stock	(5,344,160)	(3,258,126)	(9,787,501)		(6,911,897)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock	10,922,998	9,744,670	21,396,790		18,264,205
Ending balance	1,000,014,813	942,660,764	1,000,014,813		942,660,764
Retained  Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,378,904,530	1,193,171,690	1,336,940,990		1,148,386,272
Repurchases of common stock	(42,871,254)	(21,790,142)	(81,394,947)		(46,536,187)
Dividends declared	(27,627,119)	(28,011,420)	(55,370,601)		(56,058,218)
Net income	86,040,438	109,155,403	194,271,153		206,733,664
Ending balance	1,394,446,595	1,252,525,531	1,394,446,595		1,252,525,531
Accumulated  Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(7,466,326)	(12,224,497)	(6,557,122)		(14,142,934)
Other comprehensive income (loss)	(509,327)	(1,018,271)	(1,418,531)		900,166
Ending balance	$ (7,975,653)	$ (13,242,768)	$ (7,975,653)		$ (13,242,768)

[1] The condensed consolidated balance sheet at December 31, 2023 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.