Equity and Stock-Based Compensation (Stock Options Narrative) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
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

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.

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration