Derivative Financial Instruments and Hedging Activities (Fair Value of Assets and Liabilities Related to Recurring Foreign Forward Exchange Contracts) (Details 2) - Recurring $ in Thousands	May. 31, 2015 USD ($)
Assets:
Forward foreign exchange contracts, Assets	$ 15,137
Liabilities:
Forward foreign exchange contracts, Liabilities	(5,608)
Total	9,529
Level 2
Assets:
Forward foreign exchange contracts, Assets	15,137
Liabilities:
Forward foreign exchange contracts, Liabilities	(5,608)
Total	$ 9,529