Summary of Activity in Restructuring Reserves (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Restructuring Cost And Reserve [Line Items]
Additions charged to expense	$ 4,918	$ 4,801	$ 9,151	$ 11,423
MAP to Growth
Restructuring Cost And Reserve [Line Items]
Beginning balance	11,031	12,376	13,237	12,694
Additions charged to expense	4,918	4,801	9,151	11,423
Cash payments charged against reserve	(5,238)	(7,125)	(11,442)	(13,136)
Non-cash charges included above	(160)	(406)	(395)	(1,335)
Ending balance	10,551	9,646	10,551	9,646
MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance	4,893	2,946	7,357	4,837
Additions charged to expense	2,135	2,729	4,612	6,515
Cash payments charged against reserve	(2,373)	(2,109)	(7,314)	(7,786)
Ending balance	4,655	3,566	4,655	3,566
MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance	6,138	9,430	5,880	7,857
Additions charged to expense	2,288	1,821	3,809	4,593
Cash payments charged against reserve	(2,530)	(5,016)	(3,793)	(5,350)
Non-cash charges included above		(155)		(1,020)
Ending balance	5,896	6,080	5,896	6,080
MAP to Growth | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Additions charged to expense	495	251	730	315
Cash payments charged against reserve	(335)		(335)
Non-cash charges included above	$ (160)	$ (251)	$ (395)	$ (315)