Stockholders' Equity - Common Stock Outstanding (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended	20 Months Ended
	Feb. 29, 2024	Nov. 30, 2023	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023	Aug. 31, 2023	Feb. 28, 2023	Sep. 30, 2023	Sep. 30, 2022	Jul. 31, 2021
Common stock outstanding:
Common stock outstanding, beginning balances (in shares)		131,294,422		131,294,422
Common stock outstanding, ending balance (in shares)	122,440,607			122,440,607		131,294,422
2022 Share Repurchase Program
Common stock outstanding:
Share repurchase program, amount authorized										$ 1,000,000,000
Number of shares repurchased (in shares)							16,500,000
Value of shares repurchased							$ 1,000,000,000
Share repurchase program, remaining amount available			$ 0		$ 0		$ 0
2023 Share Repurchase Program
Common stock outstanding:
Share repurchase program, amount authorized								$ 2,500,000,000	$ 1,000,000,000
Number of shares repurchased (in shares)				10,400,000		2,700,000
Value of shares repurchased				$ 1,300,000,000		$ 224,000,000
Share repurchase program, remaining amount available	$ 1,200,000,000			$ 1,200,000,000
Accelerated Share Repurchase Program
Common stock outstanding:
Share repurchase program, amount authorized								$ 500,000,000
Number of shares repurchased (in shares)		3,900,000
Average price (in usd per share)		$ 128.61
Common stock:
Common stock outstanding:
Common stock outstanding, beginning balances (in shares)	128,647,431	131,294,422	134,231,300	131,294,422	135,493,980	135,493,980
Shares issued under employee stock purchase plan (in shares)	338,316		629,336	338,316	629,336
Vesting of restricted stock (in shares)	2,741		148,718	1,769,516	2,010,396
Purchases of treasury stock under employee stock plans (in shares)	(795)		(47,242)	(526,823)	(570,649)
Treasury shares purchased (in shares)	(6,547,086)		(1,723,744)	(10,434,824)	(4,324,695)
Common stock outstanding, ending balance (in shares)	122,440,607	128,647,431	133,238,368	122,440,607	133,238,368	131,294,422	133,238,368