Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative effect of change in accounting principle	Common Stock and Paid-In Capital	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle	Other Accumulated Comprehensive (Loss) Income	Other Accumulated Comprehensive (Loss) Income Cumulative effect of change in accounting principle	Treasury Stock
Beginning balance (in shares) at May. 31, 2019			184,791,000
Beginning balance at May. 31, 2019	$ 3,002,721	$ (833)	$ 1,068,256	$ 6,691,236	$ (2,808)	$ (39,152)	$ 1,975	$ (4,717,619)
Beginning balance (in shares) at May. 31, 2019								(81,506,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	876,037			876,037
Comprehensive income (loss), net of tax	(116,203)					(116,203)
Dividends	(267,956)			(267,956)
Stock-based compensation	115,435		$ 115,435
Vesting of stock-based compensation awards (in shares)			641,000
Stock options exercised (in shares)			1,361,000
Stock options exercised	90,519		$ 90,519
Repurchase of common stock (in shares)								(1,872,000)
Repurchase of common stock	(464,518)							$ (464,518)
Ending balance (in shares) at May. 31, 2020			186,793,000
Ending balance at May. 31, 2020	3,235,202		$ 1,274,210	7,296,509		(153,380)		$ (5,182,137)
Ending balance (in shares) at May. 31, 2020								(83,378,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,110,968			1,110,968
Comprehensive income (loss), net of tax	184,268					184,268
Dividends	(530,462)			(530,462)
Stock-based compensation	112,035		$ 112,035
Vesting of stock-based compensation awards (in shares)			610,000
Stock options exercised (in shares)			1,668,000
Stock options exercised	129,957		$ 129,957
Repurchase of common stock (in shares)								(1,632,000)
Repurchase of common stock	$ (554,121)							$ (554,121)
Ending balance (in shares) at May. 31, 2021	189,071,185		189,071,000
Ending balance at May. 31, 2021	$ 3,687,847		$ 1,516,202	7,877,015		30,888		$ (5,736,258)
Ending balance (in shares) at May. 31, 2021								(85,010,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,235,757			1,235,757
Comprehensive income (loss), net of tax	77,029					77,029
Dividends	(393,609)			(393,609)
Stock-based compensation	109,308		$ 109,308
Vesting of stock-based compensation awards (in shares)			528,000
Stock options exercised (in shares)			1,239,000					(71,000)
Stock options exercised	117,737		$ 146,407					$ (28,670)
Repurchase of common stock (in shares)								(4,046,000)
Repurchase of common stock	$ (1,525,873)							$ (1,525,873)
Ending balance (in shares) at May. 31, 2022	190,837,921		190,838,000
Ending balance at May. 31, 2022	$ 3,308,196		$ 1,771,917	$ 8,719,163		$ 107,917		$ (7,290,801)
Ending balance (in shares) at May. 31, 2022								(89,127,000)