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Accrued Severance (Details) - Schedule of accrued severance cost associated with cost reduction measures (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
May 31, 2013
Schedule of accrued severance cost associated with cost reduction measures [Roll Forward]      
Beginning balance $ 3.3 $ 2.7 $ 2.7
Accruals 9.7 5.3 13.4
Payments (11.9) (5.5) (12.8)
Ending balance $ 1.1 $ 2.5 $ 3.3