Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Retirement Benefits [Abstract]
Participant contribution (up to) (as a percent)	60.00%
Company match (up to) (as a percent)	4.00%
Graduated vesting schedule (term)	5 years
Company contributions	$ 11.3	$ 10.9	$ 11.6