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Long-Term Debt and Credit Facilities - Schedule of derivative instruments (Details) - Interest rate swap - USD ($) | Nov. 30, 2015 | Aug. 28, 2015 | May. 31, 2015 | Oct. 31, 2014
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Notional amount |  | $ 250,000,000 |  | $ 500,000,000
Other Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notional amount | $ 250,000,000 |  |  |
Interest rate swap ($250 million notional) | 196,000 |  | $ 0 |
Accounts Payable and Accrued Liabilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notional amount | 500,000,000 |  | 500,000,000 |
Interest rate swap ($500 million notional) | $ 6,152,000 |  | $ 6,157,000 |

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