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Equity and Stock-Based Compensation (Stock Options Narrative) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock price (usd per share) |  |  |  | $ 11.98
Intrinsic value of stock options exercised | $ 1.1 | $ 0.1 | $ 0.6 |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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