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Debt (Narrative) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2018 | Aug. 31, 2018 | Nov. 15, 2017
Debt Instrument [Line Items] |  |  |
Current debt | $ 16,662,000 | $ 23,600,000 |
Long-term borrowings | 62,400,000 | 62,800,000 |
Refinanced short-term debt | 44,000,000 |  |
Series A Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowings | 18,400,000 | 18,800,000 |
Repayment of principal | 400,000 |  |
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 |  |
Consolidated leverage ratio | 3 |  |
Consolidated interest coverage ratio | 3 |  |
Autoborrow Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Current debt | $ 15,900,000 |  |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility, additional borrowed amount | 0 |  |
Short-term |  | 20,000,000 |
Long-term borrowings | 44,000,000 | 44,000,000 |
Revolving Credit Facility [Member] | Autoborrow Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Short-term | 15,862,000 | $ 2,800,000 |
Line Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayment of short-term debt | $ 20,000,000 |  |
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 |  |

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