Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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No definition available.

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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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The carrying value as of the balance sheet date of the current and noncurrent portions 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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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 debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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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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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Line of Credit Facility, Additional Borrowed Amount

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Repayment Of Principal

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Senior Notes, Additional Maximum Borrowing Capacity

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Debt (Narrative) (Details) - USD ($)	1 Months Ended	6 Months Ended
Debt (Narrative) (Details) - USD ($)	Jan. 31, 2019	Feb. 28, 2019	Mar. 31, 2019	Mar. 22, 2019	Jan. 21, 2019	Aug. 31, 2018	Nov. 15, 2017
Debt Instrument [Line Items]
Line of credit		$ 60,000,000
Current debt		25,948,000				$ 23,600,000
Repayments Of Long Term Debt		400,000
Series A Notes [Member]
Debt Instrument [Line Items]
Repayment of principal		$ 400,000
Sixth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount					$ 175,000,000
Revolving credit facility, expiration date		May 13, 2020
Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Share buy-back plan, amount authorized		$ 150,000,000
Revolving credit facility, expiration date		Jan. 22, 2024
Consolidated leverage ratio		3
Consolidated interest coverage ratio		3
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Current debt		$ 10,100,000
Line of credit, short-term liability		30,000,000
Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit		15,000,000
Revolving credit facility, additional borrowed amount		15,000,000
Repayment of short-term debt		20,000,000
Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit		$ 45,000,000
Repayments Of Long Term Debt	$ 44,000,000
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
Subsequent Events [Member] \| Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount			$ 100,000,000	$ 125,000,000
Subsequent Events [Member] \| United Kingdom Subsidiary [Member] \| Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount			$ 50,000,000