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Employee Benefit Plans (Details) (USD $)
9 Months Ended 12 Months Ended 9 Months Ended
Feb. 28, 2014
May 31, 2014
Pension Plans
Feb. 28, 2014
United States Pension Plan
Feb. 28, 2014
United Kingdom Pension Plan
Employee Benefit Plans (Details) [Line Items]        
Pension Contributions   $ 4,600,000 $ 3,300,000 $ 1,000,000
Defined benefit plan lump sum payments triggering partial settlement, amount $ 5.4