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Income Taxes (Summary Of Tax Credit Carryforwards (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2016
USD ($)
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount $ 4,691
2017-2021 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 1,499
2022-2026 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 1,929
2027-2031 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 904
2032-2036 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 359
State [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 4,691
State [Member] | 2017-2021 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 1,499
State [Member] | 2022-2026 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 1,929
State [Member] | 2027-2031 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount 904
State [Member] | 2032-2036 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward amount $ 359
Minimum [Member] | 2017-2021 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2017
Minimum [Member] | 2022-2026 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2022
Minimum [Member] | 2027-2031 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2027
Minimum [Member] | 2032-2036 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2032
Maximum [Member] | 2017-2021 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2021
Maximum [Member] | 2022-2026 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2026
Maximum [Member] | 2027-2031 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2031
Maximum [Member] | 2032-2036 [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward, Expiration date Dec. 31, 2036