Basis Of Presentation (Details) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2010	Dec. 31, 2010
Basis Of Presentation
Correction of an immaterial error, increase in cost of goods sold	$ 0.8	$ 0.6	$ 0.7
Correction of an immaterial error, decrease in net income	0.8	0.6	0.7
Correction of an immaterial error, decrease in net income per share diluted	$ 0.01	$ 0.01	$ 0.01
Correction of an immaterial error, decrease in inventory			0.7	0.7
Correction of an immaterial error, increase in accounts payable			0.6	1.1
Correction of an immaterial error, decrease in retained earnings			$ 1.3	$ 1.8