Inventories (Narrative) (Details) - USD ($) $ in Thousands	May 31, 2023	Aug. 31, 2022	May 31, 2022
Inventory [Line Items]
Inventories, net	$ 166,759	$ 193,776	$ 195,566
LIFO, basis amount	45,300	55,500	53,700
FIFO, basis amount	$ 121,500	$ 138,300	$ 141,900