Assets Acquired and Liabilities Assumed on Acquisition (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2020	May 31, 2019	May 31, 2018
Acquisitions
Goodwill		$ 1,250,066	$ 1,245,762	$ 1,192,174
Weighted-average other intangible asset amortization life (in years)		16 years	10 years
2020 Acquisitions
Acquisitions
Current assets		$ 10,649
Property, plant and equipment		1,694
Goodwill		28,291
Trade names - indefinite lives		1,555
Other intangible assets		31,046
Other long-term assets		56
Total Assets Acquired		73,291
Liabilities assumed		(7,135)
Net Assets Acquired	[1]	$ 66,156
2019 Acquisitions
Acquisitions
Current assets			$ 29,737
Property, plant and equipment			22,607
Goodwill			75,142
Trade names - indefinite lives			14,033
Other intangible assets			59,748
Other long-term assets			3,095
Total Assets Acquired			204,362
Liabilities assumed			(33,174)
Net Assets Acquired	[2]		$ 171,188

[1] Figure includes cash acquired of $1.6 million.

[2] Figure includes cash acquired of $2.3 million.