Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Current
U.S. federal	$ 9,332	$ 35,688	$ 58,835
U.S. state and local	8,034	18,389	5,159
Non-U.S.	27,640	17,376	22,669
Total current taxes	45,006	71,453	86,663
Deferred
U.S. federal	11,896	1,813	2,079
U.S. state and local	2,665	(217)	(295)
Non-U.S.	(5,371)	(3,874)	(3,694)
Total deferred taxes	9,190	(2,278)	(1,910)
Total provision for income taxes	$ 54,196	$ 69,175	$ 84,753