Share-based Compensation - Restricted Stock Units ("RSUs") - Additional Information (Details) - Restricted stock units (“RSUs”) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	213,000
Vesting percentage per year	20.00%
Vesting term		5 years
Shares granted, fair value	$ 7	$ 8	$ 7
Weighted average grant date fair value, granted	$ 31.8	$ 52.32	$ 22.26
Total fair value of shares vested during period	$ 7	$ 15	$ 10
Compensation cost not yet recognized	$ 8
Compensation cost not yet recognized, period for recognition	2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for retirement eligibility for expense to be recognized	5 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for retirement eligibility for expense to be recognized	2 years
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares entitled to be received upon vesting	1
key Employees Under SIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	213,080	160,312	317,760