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Debt (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Debt (Narrative) (Details) - USD ($)	Aug. 31, 2018	Feb. 28, 2018	Aug. 31, 2018	Feb. 23, 2018	Nov. 15, 2017	Aug. 31, 2017
Debt Instrument [Line Items]
Current debt	$ 23,600,000		$ 23,600,000			$ 20,000,000
Long-term borrowings	62,800,000		62,800,000			134,000,000
Repatriation of foreign earnings	79,600,000
Refinanced short-term debt			64,000,000
Series A Notes [Member]
Debt Instrument [Line Items]
Long-term borrowings	18,800,000		18,800,000
Repayments of line of credit		$ 20,000,000
Repayment of principal			400,000
Fifth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	175,000,000		175,000,000
Share buy-back plan, amount authorized	$ 150,000,000		$ 150,000,000
Revolving credit facility, expiration date			May 13, 2020
Sixth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio	3		3
Consolidated interest coverage ratio	3		3
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Short-term	$ 20,000,000		$ 20,000,000			20,000,000
Long-term borrowings	44,000,000		44,000,000			$ 134,000,000
Revolving Credit Facility [Member] \| Series A Notes [Member]
Debt Instrument [Line Items]
Repayment of short-term debt			20,000,000
Revolving Credit Facility [Member] \| Line Of Credit, Headquarters Office [Member]
Debt Instrument [Line Items]
Line of credit, short-term liability	10,000,000		10,000,000
Revolving Credit Facility [Member] \| Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Short-term	2,800,000		2,800,000
Line Of Credit [Member]
Debt Instrument [Line Items]
Refinanced short-term debt			20,000,000
Line Of Credit [Member]
Debt Instrument [Line Items]
Short-term	80,000,000		80,000,000
Repatriation of foreign earnings	79,600,000
Refinanced short-term debt			44,000,000
Note Agreement [Member] \| Series A Notes [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount					$ 20,000,000
Principal amount	$ 20,000,000		$ 20,000,000
Interest rate	3.39%		3.39%
Maturity date			Nov. 15, 2032
Principal payment frequency of periodic payment			semi-annually
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		$ 8,400,000
Note Agreement [Member] \| Sixth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Additional maximum borrowing capacity				$ 15,000,000
Shelf Notes [Member]
Debt Instrument [Line Items]
Principal amount	0		$ 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		$ 105,000,000
Milton Keynes, England [Member] \| Sixth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount				15,000,000
Milton Keynes, England [Member] \| Note Agreement [Member] \| Note Amendment [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount				$ 15,000,000