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Summary of Significant Accounting Policies (Recent Accounting Developments) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2017
Retained Earnings |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 33,000 |
ASU 2016-09 |  |  |
Tax deficiency from exercise of stock options | $ 600,000 |  |
Impact on EPS diluted (USD per share) | $ 0.02 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ (19,000)
ASU 2016-09 | Retained Earnings |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 33,000

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