XML 55 R42.htm IDEA: XBRL DOCUMENT v3.6.0.2
LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of derivative instruments (Details) - Interest rate swap - USD ($)
Nov. 30, 2016
May 31, 2016
Aug. 28, 2015
Oct. 31, 2014
Debt Instrument [Line Items]        
Notional amount     $ 250,000,000 $ 500,000,000
Other Assets        
Debt Instrument [Line Items]        
Interest rate swaps $ 827,000 $ 0    
Notional amount 250,000,000 250    
Accounts Payable and Accrued Liabilities        
Debt Instrument [Line Items]        
Interest rate swaps 4,054,000 10,775,000    
Notional amount $ 500,000,000 $ 500