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Sale of RodPack Business (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2016
USD ($)
installment
May 31, 2016
USD ($)
installment
Nov. 30, 2015
USD ($)
Feb. 28, 2017
USD ($)
Feb. 29, 2016
USD ($)
Sale of RodPack Business          
Proceeds from the sale of property and assets       $ 229 $ 1,500
Acquisition related costs (Note 14)         $ 365
RodPack Business          
Sale of RodPack Business          
Total proceeds to be received     $ 2,186    
Proceeds from the sale of property and assets $ 229 $ 229 1,500    
Pre-tax book gain from the sale of property and assets     1,031    
Number of installments | installment 2 2      
Acquisition related costs (Note 14)     $ 365