Stockholders' Equity - Stock Repurchases (Details) - USD ($)		3 Months Ended
	Nov. 30, 2020	Aug. 31, 2019	Jan. 07, 2021	Jan. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Dollar Value of Shares Repurchased		$ 50,000,000.0
Class A and Class B | 2018 Authorization
Equity, Class of Treasury Stock [Line Items]
Repurchase Authorization				$ 3,000,000,000.0
Class A and Class B | 2021 Authorization | Subsequent event
Equity, Class of Treasury Stock [Line Items]
Repurchase Authorization			$ 2,000,000,000.0
Class A | 2018 Authorization
Equity, Class of Treasury Stock [Line Items]
Dollar Value of Shares Repurchased	$ 1,045,900,000
Number of shares repurchased (in shares)	4,897,605