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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments including both interest and principal payments.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Amount of stock repurchase plan authorized.

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Debt Instrument, Date Of Final Required Semi-Annual Payment

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Debt Instrument, Latest Issuance Date

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The ratio of consolidated EBITDA to consolidated interest charges for the most recently completed four fiscal quarters.

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No definition available.

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The ratio of consolidated funded indebtedness as of termination date to consolidated EBITDA for the most recently completed four fiscal quarters.

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Senior Notes, Additional Maximum Borrowing Capacity

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Debt (Narrative) (Details) - USD ($)	6 Months Ended
Debt (Narrative) (Details) - USD ($)	Feb. 28, 2018	Feb. 23, 2018	Nov. 15, 2017	Aug. 31, 2017
Debt Instrument [Line Items]
Current debt	$ 14,020,000			$ 20,000,000
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
Sixth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio	3
Consolidated interest coverage ratio	3
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	$ 5,000,000
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]
Revolving credit facility, amount			$ 20,000,000
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
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
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
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