Description of Business (Impact from Thailand Flood) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2013	Mar. 31, 2013	Sep. 30, 2012
Gain Contingencies [Line Items]
Insurance proceeds payment, from contract manufacturer, receivable	$ 8.2
Natural Disasters and Other Casualty Events
Gain Contingencies [Line Items]
Property, plant and equipment, additions				0.9	0.9	5.2
Acquisition of equipment under capital lease					1.2	4.4
Insurance proceeds payment, from contract manufacturer	14.8	4.2	4.0
Insurance proceeds payment, from contract manufacturer, forgiveness of capital lease obligations	3.4	2.2
Insurance proceeds payment, from contract manufacturer, outstanding payables	$ 3.2	$ 2.0