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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 6 Months Ended
May 27, 2014
Apr. 29, 2014
Jun. 30, 2014
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Commitments and Contingencies.      
Number of co-defendants against whom lawsuit was filed     4
Number of former employees engaged in anticompetitive activities     2
Amount of damages awarded to plaintiff $ 153.5 $ 156.0  
Amount of damages expected to be trebled under the federal antitrust laws     52
Reasonable range of potential loss, low end of the range     10.0
Reasonable range of potential loss, high end of the range     $ 38.4