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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of derivative instruments (Details) - Interest rate swap - USD ($)
Feb. 29, 2016
Aug. 28, 2015
May. 31, 2015
Oct. 31, 2014
Debt Instrument [Line Items]        
Notional amount   $ 250,000,000   $ 500,000,000
Accounts Payable and Accrued Liabilities        
Debt Instrument [Line Items]        
Interest rate swaps ($750 million notional) $ 15,818,000   $ 6,157,000  
Notional amount $ 750,000,000