Commitments and Contingencies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Mar. 31, 2014 SARs	Mar. 31, 2013 SARs	Mar. 31, 2014 SARs - 2011 Awards	Sep. 30, 2011 SARs - 2011 Awards	Mar. 31, 2014 SARs - 2012 Awards	Sep. 30, 2012 SARs - 2012 Awards	Mar. 31, 2014 Minimum SARs - 2012 Awards
Commitments and Contingencies
Average stock price period						60 days
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		0.8
Ending period for expected liability adjustment			30-Sep-15		30-Sep-16
Amount accrued for awards			$ 1.4		$ 7.9
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	$ 4.2	$ 4.9