Commitments and Contingencies (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			60 Months Ended		12 Months Ended	2 Months Ended		12 Months Ended
	Sep. 30, 2014 Employment Agreements	Sep. 30, 2014 Executive Change in Control Agreements	Sep. 30, 2013 Cash Performance Unit Awards, 2009 Grants	Sep. 30, 2013 Cash Performance Unit Awards, 2009 Grants	Sep. 30, 2014 Cash Performance Unit Awards, 2009 Grants	Sep. 30, 2014 Cash Performance Unit Awards, 2014 Grants	Sep. 30, 2012 Cash Performance Unit Awards 2012 Grants	Sep. 30, 2011 Cash Performance Unit Awards 2012 Grants	Sep. 30, 2014 Cash Performance Unit Awards 2012 Grants	Sep. 30, 2013 Cash Performance Unit Awards 2012 Grants	Sep. 30, 2012 Cash Performance Unit Awards 2012 Grants	Sep. 30, 2013 Cash Performance Unit Awards 2013 Grants	Sep. 30, 2014 Stock Appreciation Rights (SARs)	Sep. 30, 2013 Stock Appreciation Rights (SARs)	Sep. 30, 2012 Stock Appreciation Rights (SARs)	Sep. 30, 2014 Stock Appreciation Rights (SARs), 2011 Awards	Sep. 30, 2011 Stock Appreciation Rights (SARs), 2011 Awards	Sep. 30, 2014 Stock Appreciation Rights (SARS), 2012 Awards	Sep. 30, 2012 Stock Appreciation Rights (SARS), 2012 Awards	Sep. 30, 2014 Minimum Stock Appreciation Rights (SARS), 2012 Awards
Commitments and Contingencies
Compensation arrangements original term of employment agreements, maximum	3 years
Employee agreement terms	1 year
Percentage of CEO salary	72.50%
Aggregate salary commitment for salaries and other obligations under all employment agreements assuming no agreements are renewed	$ 4.5
Aggregate termination benefits	8.4
Termination benefits expensed and accrued	2.8
Aggregate value of severance payments and excess of market value of stock-based awards		24.4
Aggregate value of severance payments and excess of market value of stock-based awards expensed and accrued		9.3
Performance period			5 years
Amount of free cash flow expenses incurred				5.4
Amount of free cash flow expenses accrued and unpaid					0
Percentage of performance units vested									50.00%	50.00%
Average stock price period							60 days	60 days											60 days
Amount recorded for performance unit award grants						5.1					9.6	4.7
Performance awards which remain accrued and unpaid									4.7
Grants approved by committee to employees for cash settled stock appreciation rights (in shares)																	0.4		1.0
Grants approved by committee to employees for cash settled stock appreciation rights that remain outstanding (in shares)																0.1		0.4
Ending period for expected liability adjustment																September 30, 2015		September 30, 2016
Amount accrued for awards																0.9		4.6
Grant-date stock price (in dollars per share)																$ 3.81		$ 1.85
Percentage of stock price on grant date																				135.00%
Threshold stock price at which SARS will vest (in dollars per share)																				$ 2.50
Compensation expense													$ 4.6	$ 4.6	$ 3.6