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