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Commitments and Contingencies Commitments and Contingencies Narrative (Details) (USD $)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2010
Reduction in YTD Q3 2010 revenue due to restatement         $ 6,100,000
Impact of Restatement on Earnings Per Share, Diluted         $ 0.11
Other changes/adjustments to warranties (3,770,000) 5,631,000 2,061,000 14,643,000  
Recovery Associated With Settlement Of Product Claims       8,600,000  
A specific batch of C&I meters that were manufactured with a misaligned automated solder-feeder [Member]
         
Other changes/adjustments to warranties $ (4,300,000)