Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019
Debt Instrument [Line Items]
Total short-term borrowings	$ 29,088	$ 21,205
Long-term borrowings	61,152	60,221
Total	90,240	81,426
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Total short-term borrowings	13,300
Series A Notes [Member]
Debt Instrument [Line Items]
Current portion of long-term debt	800	800
Long-term borrowings	17,600	18,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Short-term borrowings	15,000	20,000
Long-term borrowings	43,552	42,221
Revolving Credit Facility [Member] | Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Short-term borrowings	$ 13,288	$ 405