Summary of Activity in Restructuring Reserves (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2020	May 31, 2019	May 31, 2018
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		$ 33,108	$ 42,310	$ 17,514
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Beginning balance		12,694	17,514
Additions charged to expense		33,108	42,310	17,514
Cash payments charged against reserve		(26,277)	(34,238)
Non-cash charges included above	[1]	(6,288)	(12,892)
Ending balance		13,237	12,694	17,514
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance		4,837	9,957
Additions charged to expense		19,747	32,519	9,957
Cash payments charged against reserve		(17,038)	(31,219)
Non-cash charges included above	[1]	(189)	(6,420)
Ending balance		7,357	4,837	9,957
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		8,548	8,195	6,184
Cash payments charged against reserve		(9,239)	(3,019)
Non-cash charges included above	[1]	(1,286)	(3,503)
Ending balance		5,880	7,857	6,184
2020 MAP to Growth | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Beginning balance			1,373
Additions charged to expense		4,813	1,596	1,373
Non-cash charges included above	[1]	$ (4,813)	$ (2,969)
Ending balance				$ 1,373

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