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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 6 Months Ended
May 31, 2013
Lawsuits for alleged quality defects
item
Nov. 30, 2013
Acquisition-related contingencies
Litigation    
Number of lawsuits yet to be filed 0  
Potential acquisition-related contingent consideration, low end of range   $ 0
Potential acquisition-related contingent consideration, high end of range   $ 25.6
Period over which potential acquisition-related contingent consideration would be payable   5 years