Summary of Activity in Restructuring Reserves (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Restructuring Cost And Reserve [Line Items]
Additions charged to expense	$ 6,622	$ 20,076
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Beginning balance	12,694	17,514
Additions charged to expense	6,622	20,076
Cash payments charged against reserve	(6,011)	(12,993)
Non-cash charges included above	(929)	(8,273)
Ending balance	12,376	16,324
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance	4,837	9,957
Additions charged to expense	3,786	19,062
Cash payments charged against reserve	(5,677)	(12,575)
Non-cash charges included above		(5,484)
Ending balance	2,946	10,960
2020 MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance	7,857	6,184
Additions charged to expense	2,772	436
Cash payments charged against reserve	(334)	(418)
Non-cash charges included above	(865)	(838)
Ending balance	9,430	5,364
2020 MAP to Growth | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Beginning balance		1,373
Additions charged to expense	64	578
Non-cash charges included above	$ (64)	$ (1,951)