Assets Acquired and Liabilities Assumed on Acquisition (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2021	May 31, 2020	May 31, 2019
Acquisitions
Goodwill		$ 1,345,754	$ 1,250,066	$ 1,245,762
Weighted-average other intangible asset amortization life (in years)		20 years	16 years
2021 Acquisitions
Acquisitions
Current assets		$ 50,310
Property, plant and equipment		27,012
Goodwill		41,654
Trade names - indefinite lives		16,694
Other intangible assets		53,894
Other long-term assets		6,831
Total Assets Acquired		196,395
Liabilities assumed		(24,232)
Net Assets Acquired	[1]	$ 172,163
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	[2]		$ 66,156

[1] Figure includes cash acquired of $6.4 million.

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