Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	May 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements of contingent consideration obligations	$ 4.0
Fair Value, Measurements, Recurring | Foreign currency forward contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts, fair value of assets	$ 0.1
Foreign currency contracts, fair value of liability		$ 0.2