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Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Exercisable (Details) (SSARs and Stock Options, USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options / SSARs outstanding (shares)	650,233
Stock options / SSARs outstanding - weighted average contractual remaining life	2 years 10 months 17 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share)	$ 18.12	$ 33.01	$ 48.80	$ 48.85
Stock options / SSARs exercisable (shares)	355,703
Stock options / SSARs exercisable - weightedaverage contyractual remaining life	3 years 0 months 7 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share)	$ 19.74	$ 48.73	$ 58.61
$1 - $15
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options / SSARs - exercise price range, lower limit	$ 1
Stock options / SSARs - exercise price range, upper limit	$ 15
Stock options / SSARs outstanding (shares)	255,747
Stock options / SSARs outstanding - weighted average contractual remaining life	5 years 8 months 16 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share)	$ 12.28
Stock options / SSARs exercisable (shares)	120,644
Stock options / SSARs exercisable - weightedaverage contyractual remaining life	5 years 6 months 15 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share)	$ 11.85
$15 - $20
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options / SSARs - exercise price range, lower limit	$ 16
Stock options / SSARs - exercise price range, upper limit	$ 20
Stock options / SSARs outstanding (shares)	250,826
Stock options / SSARs outstanding - weighted average contractual remaining life	5 years 2 months 23 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share)	$ 19.30
Stock options / SSARs exercisable (shares)	92,224
Stock options / SSARs exercisable - weightedaverage contyractual remaining life	1 year 11 months 27 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share)	$ 19.61
$21 - $75
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options / SSARs - exercise price range, lower limit	$ 21
Stock options / SSARs - exercise price range, upper limit	$ 75
Stock options / SSARs outstanding (shares)	143,660
Stock options / SSARs outstanding - weighted average contractual remaining life	2 years 10 months 6 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share)	$ 26.48
Stock options / SSARs exercisable (shares)	142,835
Stock options / SSARs exercisable - weightedaverage contyractual remaining life	2 years 9 months 29 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share)	$ 26.44
$1 - $75
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options / SSARs - exercise price range, lower limit	$ 1
Stock options / SSARs - exercise price range, upper limit	$ 75

X

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of SSARs and options outstanding and currently exercisable under the plan.

+ References

No definition available.

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- Definition

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- Definition

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- Definition

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- Definition

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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