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Sale of Product Line (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 31, 2016
Feb. 28, 2018
Feb. 28, 2017
Discontinued Operations      
Amount received from sale of assets   $ 1.3 $ 5.9
Sonoco | Long-term manufacturing agreement to supply temperature-controlled containers      
Discontinued Operations      
Term of long-term manufacturing agreement 3 years    
Temperature-controlled container product line | Disposed of by sale      
Discontinued Operations      
Sale consideration $ 5.0    
Amount received from sale of assets 3.0    
Non-contingent deferred consideration amount in the sale consideration $ 2.0    
Period over which non-contingent deferred consideration is due 2 years    
Gain on sale of assets $ 2.6