Derivatives (Schedule Of Commodity Swap Contracts Outstanding) (Details) - Brass [Member] - Cash Flow Hedging [Member] $ in Millions	12 Months Ended
Sep. 30, 2018 USD ($) T	Sep. 30, 2017 USD ($) T
Derivative [Line Items]
Notional Amount \| T	1.0	1.3
Contract Value \| $	$ 5.6	$ 6.6

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant