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Debt (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
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 |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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