Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands |
May. 31, 2015 |
Nov. 30, 2014 |
|---|---|---|
| Derivative [Line Items] | ||
| Derivative contracts, notional value | $ 93,727 | $ 37,272 |
| Derivative contracts, fair value | (2,449) | (102) |
| Forward contracts to sell U.S. dollars [Member] | ||
| Derivative [Line Items] | ||
| Derivative contracts, notional value | 83,747 | 21,738 |
| Derivative contracts, fair value | (2,455) | (13) |
| Forward contracts to purchase U.S. dollars [Member] | ||
| Derivative [Line Items] | ||
| Derivative contracts, notional value | 9,980 | 15,534 |
| Derivative contracts, fair value | $ 6 | $ (89) |