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	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2011
Insurance Recoveries, To Date
Insurance proceeds payment, from contract manufacturer, receivable	$ 8.2
Natural Disasters and Other Casualty Events
Asset Write-downs
Inventory, damaged by Thailand flood, writedown (recovery)				0.1		4.0
Equipment, write-down, damaged by Thailand flood						1.8
Equipment under capital lease, write-down, damaged by Thailand flood								1.9
Loss on Inventory Purchase Commitments
Loss on inventory purchase commitments				0.4	1.3
Capital Lease Obligations
Property, plant and equipment, additions				0.9	0.9		5.2
Capital lease obligations incurred					1.2		4.4
Insurance Recoveries, To Date
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
Insurance proceeds payment, from company policy					$ 5.0