Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2014	May 31, 2014
Derivative Instruments And Hedging Activities [Line Items]
Hedged portion of net investment	$ 1,160.0
Hedged portion of net investment, as a percentage	41.84%
Swap liability	15.5	20.2
Derivatives not designated as hedging instruments on a gross basis assets	6.0	1.1
Not Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]
Derivative Instruments And Hedging Activities [Line Items]
Derivatives not designated as hedging instruments on a gross basis liabilities	0.4	1.3
Swap agreements [Member]
Derivative Instruments And Hedging Activities [Line Items]
Effective weighted average interest rate on all outstanding debt, including the interest rate swaps	5.15%	5.37%
Short-term [Member]
Derivative Instruments And Hedging Activities [Line Items]
Swap liability	6.7	8.8
Long-term [Member]
Derivative Instruments And Hedging Activities [Line Items]
Swap liability	9.0	11.6
Credit valuation adjustment [Member]
Derivative Instruments And Hedging Activities [Line Items]
Swap liability	$ (0.2)	$ (0.2)
U.S. dollar term loan [Member]
Derivative Instruments And Hedging Activities [Line Items]
Effective interest rate	3.62%
Term loan fixed interest rate	4.84%