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Derivatives (Schedule Of Commodity Swap Contracts Outstanding) (Details) - Brass [Member] - Cash Flow Hedging [Member] $ in Millions	9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) T	Sep. 30, 2017 USD ($) T
Derivative [Line Items]
Notional Amount | T	1.0	1.3
Contract Value | $	$ 5.4	$ 6.6

X

- Definition

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

+ References

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

+ Details

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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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