Pension Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Aug. 31, 2016	May 31, 2016
Pension Benefits, U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to retirement plans in the next fiscal year		$ 54.1
Contribution to retirement plans in the current remaining fiscal year	$ 54.1
Pension Benefits, Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to retirement plans in the next fiscal year		$ 6.0
Contribution to retirement plans in the current remaining fiscal year	$ 6.0