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Summary Of Significant Accounting (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
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 $ 2,579    
Increase in noncontrolling interest (44) $ 44  
Other Commitments [Line Items]      
Letters of Credit Outstanding, Amount 6,609    
New Accounting Pronouncement Early Adoption [Line Items]      
Allowance for Doubtful Accounts Receivable 868 650 $ 736
Deferred financing cost amortization 288 294 $ 345
Unamortized Debt Issuance Expense 912 1,115  
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability 5,286 5,306  
Accrued Insurance $ 6,202 $ 6,204  
LossContingencyAccrualInsuranceRelatedAssessmentDiscountRate 2.90% 1.90%  
Deferred Tax Assets (Liabilities), Net $ 46,580 $ 86,211  
Number Of Single Customers Comprising More Than Ten Percent Of Consolidated Net Sales 0    
Tax Period [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 24.53% 35.00%  
Income Tax Reconciliation Change In Enacted Tax Rate $ 31,333    
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit $ 1,908 $ 3,284  
Current [Member]      
Tax Period [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 24.53%    
Previous [Member]      
Tax Period [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%    
Future [Member]      
Tax Period [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 21.00%    
Insurance Related [Member]      
Other Commitments [Line Items]      
Letters of Credit Outstanding, Amount $ 6,101