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Summary Of Significant Accounting (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |
Minority Interest Change In Redemption Value | $ 44 |  |
Other Commitments [Line Items] |  |  |
Letters of Credit Outstanding, Amount | 6,493 |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |
Allowance for Doubtful Accounts Receivable | 650 | $ 736 | $ 842
Debt Issuance Costs | 294 | 345 | $ 316
Unamortized Debt Issuance Costs | 1,115 | 976 |
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | 5,306 | 5,223 |
Accrued Insurance | $ 6,204 | $ 5,464 |
LossContingencyAccrualInsuranceRelatedAssessmentDiscountRate | 1.90% | 1.10% |
Deferred Tax Assets (Liabilities), Net | $ 86,211 | $ 93,549 |
Number Of Single Customers Comprising More Than Ten Percent Of Consolidated Net Sales | 0 |  |
Labor And Related Expense | $ 3,893 |  |
Commercial & Industrial [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Minority Interest Ownership Percentage By Noncontrolling Owners | 20.00% |  |
Minority Interest Ownership Percentage By Parent | 80.00% |  |
Minority Interest Redemption Value | $ 2,770 |  |
Minority Interest Change In Redemption Value | 44 |  |
Insurance Related [Member] |  |  |
Other Commitments [Line Items] |  |  |
Letters of Credit Outstanding, Amount | 5,985 |  |
Adjustments For New Accounting Principle Early Adoption [Member] | Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |
Adjustment To Retained Earnings Recognized Deferred Tax Asset Related Stock Compensation Expense | 363 |  |
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets 1 | 59 |  |
Adjustments For New Accounting Principle Early Adoption [Member] | Accounting Standards Update 2016-18 [Member] |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets 1 | $ 260 |  |

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