Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Aug. 31, 2014	May 31, 2014
Derivative Instruments And Hedging Activities [Line Items]
Hedged portion of net investment	$ 1,355.0
Hedged portion of net investment, as a percentage	47.13%
Swap liability	14.8	20.2
Derivatives not designated as hedging instruments on a gross basis assets	3.0	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	3.4	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	5.24%	5.37%
Short-term [Member]
Derivative Instruments And Hedging Activities [Line Items]
Swap liability	7.0	8.8
Long-term [Member]
Derivative Instruments And Hedging Activities [Line Items]
Swap liability	8.0	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	3.63%
Term loan fixed interest rate	5.07%