Inventories - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Inventory [Line Items]
Beneficial effect of LIFO inventory liquidation	$ (1.1)	$ (14.2)
Reduction to net loss resulting from effect of LIFO inventory liquidation			$ 1.1	$ 14.2