Summary of Activity in Restructuring Reserves (Detail) - USD ($) $ in Thousands		3 Months Ended
		Aug. 31, 2020	Aug. 31, 2019
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		$ 4,233	$ 6,622
MAP to Growth
Restructuring Cost And Reserve [Line Items]
Beginning balance		13,237	12,694
Additions charged to expense		4,233	6,622
Cash payments charged against reserve		(6,205)	(6,011)
Non-cash charges included above	[1]	(234)	(929)
Ending balance		11,031	12,376
MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance		7,357	4,837
Additions charged to expense		2,478	3,786
Cash payments charged against reserve		(4,942)	(5,677)
Ending balance		4,893	2,946
MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance		5,880	7,857
Additions charged to expense		1,521	2,772
Cash payments charged against reserve		(1,263)	(334)
Non-cash charges included above	[1]		(865)
Ending balance		6,138	9,430
MAP to Growth | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		234	64
Non-cash charges included above	[1]	$ (234)	$ (64)

[1] Non-cash charges primarily include accelerated vesting of equity awards and asset-write offs.