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Debt (Narrative) (Details) - USD ($)	3 Months Ended
Debt (Narrative) (Details) - USD ($)	Nov. 30, 2018	Aug. 31, 2018	Nov. 15, 2017
Debt Instrument [Line Items]
Current debt	$ 16,662,000	$ 23,600,000
Long-term borrowings	62,400,000	62,800,000
Refinanced short-term debt	44,000,000
Series A Notes [Member]
Debt Instrument [Line Items]
Long-term borrowings	18,400,000	18,800,000
Repayment of principal	400,000
Fifth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	175,000,000
Share buy-back plan, amount authorized	$ 150,000,000
Revolving credit facility, expiration date	May 13, 2020
Consolidated leverage ratio	3
Consolidated interest coverage ratio	3
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Current debt	$ 15,900,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, additional borrowed amount	0
Short-term		20,000,000
Long-term borrowings	44,000,000	44,000,000
Revolving Credit Facility [Member] \| Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Short-term	15,862,000	$ 2,800,000
Line Of Credit [Member]
Debt Instrument [Line Items]
Repayment of short-term debt	$ 20,000,000
Note Agreement [Member]
Debt Instrument [Line Items]
Principal payment frequency of periodic payment	semi-annually
Note Agreement [Member] \| Series A Notes [Member]
Debt Instrument [Line Items]
Principal amount			$ 20,000,000
Interest rate	3.39%
Maturity date	Nov. 15, 2032
Date of first payment required	May 15, 2018
Periodic payment amount	$ 400,000
Date of final semi-annual payment required	May 15, 2032
Balloon payment	$ 8,400,000
Shelf Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 0
Latest date to issue senior notes	Nov. 15, 2020
Period of debt issuance and maturity	15 years 6 months
Maximum [Member] \| Shelf Notes [Member]
Debt Instrument [Line Items]
Additional maximum borrowing capacity	$ 105,000,000