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Commitments and Contingencies (Details) (Garden City lease, USD $)
In Millions, unless otherwise specified
0 Months Ended
Oct. 03, 2003
May 31, 2013
Garden City lease
   
Sale-leaseback transaction    
Net proceeds from sale of facility $ 14.0  
Cost of the facility 9.5  
Accumulated depreciation of the facility 4.6  
Deferred gain realized on the sale 9.1  
Deferred gain amortization period 20 years  
Unamortized balance of the deferred gain   $ 4.8