Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands	May 31, 2020	Sep. 01, 2019	Aug. 31, 2019	May 31, 2019
Basis Of Presentation [Line Items]
Right of use asset	$ 27,663		$ 0	$ 0
Lease liability	$ 31,379
ASU 2016-02 [Member]
Basis Of Presentation [Line Items]
Right of use asset		$ 26,200
Lease liability		$ 29,500