Summary of Activity in Restructuring Reserves (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Restructuring Cost And Reserve [Line Items]
Additions charged to expense	$ 4,801	$ 7,724	$ 11,423	$ 27,800
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Beginning balance	12,376	16,324	12,694	17,514
Additions charged to expense	4,801	7,724	11,423	27,800
Cash payments charged against reserve	(7,125)	(7,343)	(13,136)	(20,336)
Non-cash charges included above	(406)	(3,743)	(1,335)	(12,016)
Ending balance	9,646	12,962	9,646	12,962
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance	2,946	10,960	4,837	9,957
Additions charged to expense	2,729	6,533	6,515	25,595
Cash payments charged against reserve	(2,109)	(6,013)	(7,786)	(18,588)
Non-cash charges included above		(1,053)		(6,537)
Ending balance	3,566	10,427	3,566	10,427
2020 MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance	9,430	5,364	7,857	6,184
Additions charged to expense	1,821	1,037	4,593	1,473
Cash payments charged against reserve	(5,016)	(1,330)	(5,350)	(1,748)
Non-cash charges included above	(155)	(2,536)	(1,020)	(3,374)
Ending balance	6,080	2,535	6,080	2,535
2020 MAP to Growth | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Beginning balance				1,373
Additions charged to expense	251	154	315	732
Non-cash charges included above	$ (251)	$ (154)	$ (315)	$ (2,105)