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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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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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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 a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

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Amount of stock repurchase plan authorized.

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Debt Covenant, Capital Investments Permitted

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Debt Covenant, Capital Investments Permitted Carryforward Limit

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Debt Covenant, Maximum Dividends As Percentage Of Net Income In Prior Four Quarters

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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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Number Of Debt Agreements

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Repayment Of Principal

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Senior Notes, Additional Maximum Borrowing Capacity

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Unrecognized Tax Benefits, Reserve Accrued

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Debt (Narrative) (Details)		3 Months Ended	9 Months Ended
Debt (Narrative) (Details)	Mar. 16, 2020 USD ($)	Feb. 29, 2020 USD ($)	May 31, 2020 USD ($) agreement	Mar. 27, 2020 USD ($)	Aug. 31, 2019 USD ($)	Nov. 15, 2017 USD ($)
Debt Instrument [Line Items]
Number of agreements \| agreement			2
Additional maximum borrowing capacity				$ 80,000,000.0
Line of credit			$ 147,400,000
Current debt			70,800,000		$ 21,205,000
Reserved accrued					$ 8,700,000
Series A Notes [Member]
Debt Instrument [Line Items]
Repayment of principal			$ 800,000
Fifth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio			3
Consolidated interest coverage ratio			3
Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	$ 150,000,000.0	$ 100,000,000.0
Share buy-back plan, amount authorized			$ 150,000,000.0
Maturity date			Mar. 16, 2025
Maximum dividends percentage			75.00%
Capital investments permitted, Carryforward limit	5,000,000.0
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Current debt			$ 0
Line of credit, short-term liability			30,000,000.0
Other Unsecured Debt [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount			35,000,000.0
Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Capital investments permitted, Carryforward limit		2,500,000
Amended And Restated Credit Agreement, Year 2020 [Member]
Debt Instrument [Line Items]
Capital investments permitted	30,500,000
Amended And Restated Credit Agreement, Year 2021 [Member]
Debt Instrument [Line Items]
Capital investments permitted	19,000,000.0
Amended And Restated Credit Agreement, Year 2022, 2023, 2024, and 2025 [Member]
Debt Instrument [Line Items]
Capital investments permitted	15,000,000.0
Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit, short-term liability			90,000,000.0
Repayment of short-term debt			5,000,000.0
Refinanced short-term debt			70,000,000.0
Line Of Credit [Member]
Debt Instrument [Line Items]
Refinanced short-term debt			$ 77,400,000
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						$ 20,000,000.0
Interest rate			3.39%
Maturity date			Nov. 15, 2032
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
United Kingdom Subsidiary [Member] \| Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount		$ 50,000,000.0
Europe, The Middle East, Africa And India Subsidiary [Member] \| Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	$ 100,000,000.0
Maximum [Member] \| Shelf Notes [Member]
Debt Instrument [Line Items]
Additional maximum borrowing capacity			$ 105,000,000.0
Latest date to issue senior notes			Nov. 15, 2020
Period of debt issuance			15 years 6 months