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Basis Of Presentation (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2011 | Sep. 30, 2010 | Sep. 30, 2010 | Dec. 31, 2010
Basis Of Presentation [Abstract] |  |  |  |
Correction of an immaterial error, increase in cost of goods sold | $ 0.8 | $ 0.5 | $ 1.3 |
Correction of an immaterial error, decrease in net income | 0.8 | 0.5 | 1.3 |
Correction of an immaterial error, decrease in net income per share diluted | $ 0.01 | $ 0.01 | $ 0.02 |
Correction of an immaterial error, decrease in inventory |  |  | 0.7 | 0.7
Correction of an immaterial error, increase in accounts payable |  |  | 1.1 | 1.1
Correction of an immaterial error, decrease in retained earnings |  |  | $ 1.8 | $ 1.8

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