Pension Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	May 31, 2012
Pension Benefits, U.S. Plans
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Contribution to retirement plans in current fiscal year	$ 24.5	$ 29.9
Reduction in contribution to retirement plans in current fiscal year	(5.4)
Pension Benefits, Non-U.S. Plans
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Contribution to retirement plans in current fiscal year		$ 8.3