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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
 7 Months Ended 12 Months Ended
Dec. 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Commitments and Contingencies Disclosure [Abstract]        
Operating Leases, Rent Expense, Net $ 19,200 $ 19,700 $ 17,500 $ 16,000
Operating Leases        
2017 36,885      
2018 33,952      
2019 30,010      
2020 23,333      
2021 21,173      
Thereafter 137,715      
Total future minimum lease payments 283,068      
Purchase Obligations        
2017 43,567      
2018 40,191      
2019 36,464      
2020 30,748      
2021 28,051      
Thereafter 36,383      
Total future minimum payments $ 215,404