Aggregate salary commitment under all employment agreements assuming no agreements are renewed.

No definition available.

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- Definition

Aggregate value of severance payments and excess of market value of stock-based awards.

+ References

No definition available.

+ Details

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- Definition

Represents the aggregate value of severance payments and excess of market value of stock-based awards expensed and accrued during the period.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of aggregate termination benefits.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of termination benefits expensed and accrued during the period.

+ References

No definition available.

+ Details

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- Definition

Represents the measurement period in days where the SARs vest if the stock price exceeds a minimum percentage of the stock price on the grant date.

+ References

No definition available.

+ Details

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- 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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- Definition

Original term of employment compensation agreements.

+ References

No definition available.

+ Details

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- Definition

Employee agreement terms of renewal.

+ References

No definition available.

+ Details

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- Definition

The number of employees, excluding the CEO and CFO, with employment agreements.

+ References

No definition available.

+ Details

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- Definition

Represents the expense recorded for performance unit awards granted during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the grants approved by the committee to Employees for cash settled stock appreciation rights.

+ References

No definition available.

+ Details

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- Definition

Represents the grants approved by the committee to Employees for cash settled stock appreciation rights that remain outstanding.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Represents the percentage of performance unit awards vested.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Number of years after date of grant for which terms may be adjusted based on cash flows generated during that period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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- Definition

The percentage rate of salary on which supplemental retirement contributions are determined for the first specified term per the employment agreement.

+ References

No definition available.

+ Details

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- Definition

The percentage rate of salary on which supplemental retirement contributions are determined for the second specified term per the employment agreement.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Commitments and Contingencies - Compensation Arrangements (Details) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2016 USD ($) employee shares	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013	Sep. 30, 2012 shares	Sep. 30, 2011 shares
Commitments and Contingencies
Compensation benefit	$ (1.1)	$ (1.0)	$ 0.0
Employment Agreements
Commitments and Contingencies
Number of employees, excluding the CEO and CFO, with employment agreements \| employee	5
Aggregate salary commitment for salaries and other obligations under all employment agreements assuming no agreements are renewed	$ 5.4
Aggregate termination benefits	12.0
Termination benefits expensed and accrued	4.1
Executive Change in Control Agreements
Commitments and Contingencies
Aggregate value of severance payments and excess of market value of stock-based awards	24.5
Aggregate value of severance payments and excess of market value of stock-based awards expensed and accrued	$ 9.9
Cash Performance Unit Awards, 2014 Grants
Commitments and Contingencies
Average stock price period			60 days	60 days
Number of years after date of grant for which terms may be adjusted based on cash flows generated during that period	2 years
Amount recorded for performance unit award grants			$ 5.1
Cash Performance Unit Awards 2013 Grants
Commitments and Contingencies
Percentage of performance units vested	50.00%	50.00%
Cash Performance Unit Awards, 2015 and 2016 Grants
Commitments and Contingencies
Amount recorded for performance unit award grants	$ 3.5	$ 8.6
Performance awards which remain accrued and unpaid	13.7
Stock Appreciation Rights (SARs)
Commitments and Contingencies
Compensation expense		$ 3.1	$ 4.6
Compensation benefit	$ (0.1)
Stock Appreciation Rights (SARs), 2011 Awards
Commitments and Contingencies
Grants approved by committee to employees for cash settled stock appreciation rights (in shares) \| shares						0.4
Grants approved by committee to employees for cash settled stock appreciation rights that remain outstanding (in shares) \| shares	0.0
Stock Appreciation Rights (SARS), 2012 Awards
Commitments and Contingencies
Grants approved by committee to employees for cash settled stock appreciation rights (in shares) \| shares					1.0
Grants approved by committee to employees for cash settled stock appreciation rights that remain outstanding (in shares) \| shares	0.0
Chief Executive Officer \| Employment Agreements
Commitments and Contingencies
Term of renewal	1 year
Percentage of salary on which supplemental retirement contributions are determined, first term	72.50%
Percentage of salary on which supplemental retirement contributions are determined, remaining term	42.50%
Chief Financial Officer \| Employment Agreements
Commitments and Contingencies
Term of renewal	1 year
Minimum \| Employment Agreements
Commitments and Contingencies
Original term of employment agreements	3 years
Maximum \| Employment Agreements
Commitments and Contingencies
Original term of employment agreements	5 years