Note 4 - Inventories (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012
LIFO Inventory Amount	$ 15.2		$ 15.2		$ 19.7
Inventory Difference Using FIFO Basis	31.6		31.6		27.5
Increase in Cost of Sales Using LIFO Compared to FIFO	$ 3.1	$ 0.9	$ 4.1	$ 0.7